Parsley, sage, rosemary and thyme.

Remember me to one who lives there.

He once was the true love of mine.

Willem is taking the girl to the highest building in island No.28, however, neither of them knows how to get there.

Willem asks his friend, Grick for directions, Grick helped them, and gave them a task.

Although the girl wants to help, Willem insists on doing it by himself.

Grick gave Willem a string of length *n*.

Willem needs to do *m* operations, each operation has four parameters *l*, *r*, *c*<sub class="lower-index">1</sub>, *c*<sub class="lower-index">2</sub>, which means that all symbols *c*<sub class="lower-index">1</sub> in range [*l*, *r*] (from *l*-th to *r*-th, including *l* and *r*) are changed into *c*<sub class="lower-index">2</sub>. String is 1-indexed.

Grick wants to know the final string after all the *m* operations.
The first line contains two integers *n* and *m* (1 ≤ *n*, *m* ≤ 100).

The second line contains a string *s* of length *n*, consisting of lowercase English letters.

Each of the next *m* lines contains four parameters *l*, *r*, *c*<sub class="lower-index">1</sub>, *c*<sub class="lower-index">2</sub> (1 ≤ *l* ≤ *r* ≤ *n*, *c*<sub class="lower-index">1</sub>, *c*<sub class="lower-index">2</sub> are lowercase English letters), separated by space.
For the second example:

After the first operation, the string is wxxak.

After the second operation, the string is waaak.

After the third operation, the string is gaaak.
3 1
ioi
1 1 i n
noi
5 3
wxhak
3 3 h x
1 5 x a
1 3 w g
gaaak
9 51
bhfbdcgff
2 3 b b
2 8 e f
3 8 g f
5 7 d a
1 5 e b
3 4 g b
6 7 c d
3 6 e g
3 6 e h
5 6 a e
7 9 a c
4 9 a h
3 7 c b
6 9 b g
1 7 h b
4 5 a e
3 9 f a
1 2 c h
4 8 a c
3 5 e d
3 4 g f
2 3 d h
2 3 d e
1 7 d g
2 6 e g
2 3 d g
5 5 h h
2 8 g d
8 9 a f
5 9 c e
1 7 f d
1 6 e e
5 7 c a
8 9 b b
2 6 e b
6 6 g h
1 2 b b
1 5 a f
5 8 f h
1 5 e g
3 9 f h
6 8 g a
4 6 h g
1 5 f a
5 6 a c
4 8 e d
1 4 d g
7 8 b f
5 6 h b
3 9 c e
1 9 b a
aahaddddh
28 45
dcbbaddjhbeefjadjchgkhgggfha
10 25 c a
13 19 a f
12 28 e d
12 27 e a
9 20 b e
7 17 g d
22 26 j j
8 16 c g
14 16 a d
3 10 f c
10 26 d b
8 17 i e
10 19 d i
6 21 c j
7 22 b k
17 19 a i
4 18 j k
8 25 a g
10 27 j e
9 18 g d
16 23 h a
17 26 k e
8 16 h f
1 15 d f
22 28 k k
11 20 c k
6 11 b h
17 17 e i
15 22 g h
8 18 c f
4 16 e a
8 25 b c
6 24 d g
5 9 f j
12 19 i h
4 25 e f
15 25 c j
15 27 e e
11 20 b f
19 27 e k
2 21 d a
9 27 k e
14 24 b a
3 6 i g
2 26 k f
fcbbajjfjaaefefehfahfagggfha
87 5
nfinedeojadjmgafnaogekfjkjfncnliagfchjfcmellgigjjcaaoeakdolchjcecljdeblmheimkibkgdkcdml
47 56 a k
51 81 o d
5 11 j h
48 62 j d
16 30 k m
nfinedeohadjmgafnaogemfjmjfncnliagfchjfcmellgigddckkdekkddlchdcecljdeblmheimkibkgdkcdml
5 16
acfbb
1 2 e f
2 5 a f
2 3 b e
4 4 f a
2 3 f a
1 2 b e
4 5 c d
2 4 e c
1 4 e a
1 3 d c
3 5 e b
3 5 e b
2 2 e d
1 3 e c
3 3 a e
1 5 a a
acebb
94 13
bcaaaaaaccacddcdaacbdaabbcbaddbccbccbbbddbadddcccbddadddaadbdababadaacdcdbcdadabdcdcbcbcbcbbcd
52 77 d d
21 92 d b
45 48 c b
20 25 d a
57 88 d b
3 91 b d
64 73 a a
5 83 b d
2 69 c c
28 89 a b
49 67 c b
41 62 a c
49 87 b c
bcaaaaaaccacddcdaacddaaddcdbdddccdccddddddbdddddcdddcdddccdddcdcdcdcccdcddcdcdcddcdcdcdcdcdbcd
67 39
acbcbccccbabaabcabcaaaaaaccbcbbcbaaaacbbcccbcbabbcacccbbabbabbabaac
4 36 a b
25 38 a a
3 44 b c
35 57 b a
4 8 a c
20 67 c a
30 66 b b
27 40 a a
2 56 a b
10 47 c a
22 65 c b
29 42 a b
1 46 c b
57 64 b c
20 29 b a
14 51 c a
12 55 b b
20 20 a c
2 57 c a
22 60 c b
16 51 c c
31 64 a c
17 30 c a
23 36 c c
28 67 a c
37 40 a c
37 50 b c
29 48 c b
2 34 b c
21 53 b a
26 63 a c
23 28 c a
51 56 c b
32 61 b b
64 67 b b
21 67 b c
8 53 c c
40 62 b b
32 38 c c
accccccccaaaaaaaaaaaaaaaaaaaccccccccccccccccccccccccccccccccccccccc
53 33
hhcbhfafeececbhadfbdbehdfacfchbhdbfebdfeghebfcgdhehfh
27 41 h g
18 35 c b
15 46 h f
48 53 e g
30 41 b c
12 30 b f
10 37 e f
18 43 a h
10 52 d a
22 48 c e
40 53 f d
7 12 b h
12 51 f a
3 53 g a
19 41 d h
22 29 b h
2 30 a b
26 28 e h
25 35 f a
19 31 h h
44 44 d e
19 22 e c
29 44 d h
25 33 d h
3 53 g c
18 44 h b
19 28 f e
3 22 g h
8 17 c a
37 51 d d
3 28 e h
27 50 h h
27 46 f b
hhcbhfbfhfababbbbbbbbbbbbbbbbbeaaeaaeaaeabebdeaahahdh
83 10
fhbecdgadecabbbecedcgfdcefcbgechbedagecgdgfgdaahchdgchbeaedgafdefecdchceececfcdhcdh
9 77 e e
26 34 b g
34 70 b a
40 64 e g
33 78 h f
14 26 a a
17 70 d g
56 65 a c
8 41 d c
11 82 c b
fhbecdgacebabbbebegbgfgbefbggebhgegagebgggfggaafbfggbfagbgggbfggfebgbfbeebebfbdhbdh
1 4
e
1 1 c e
1 1 e a
1 1 e c
1 1 d a
a
71 21
aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa
61 61 a a
32 56 a a
10 67 a a
7 32 a a
26 66 a a
41 55 a a
49 55 a a
4 61 a a
53 59 a a
37 58 a a
7 63 a a
39 40 a a
51 64 a a
27 37 a a
22 71 a a
4 45 a a
7 8 a a
43 46 a a
19 28 a a
51 54 a a
14 67 a a
aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa
30 4
eaaddabedcbbcccddbabdecadcecce
2 17 c a
16 29 e e
16 21 c b
7 11 b c
eaaddacedacbaaaddbabdecadcecce
48 30
aaaabaabbaababbbaabaabaababbabbbaabbbaabaaaaaaba
3 45 a b
1 14 a a
15 32 a b
37 47 a b
9 35 a b
36 39 b b
6 26 a b
36 44 a a
28 44 b a
29 31 b a
20 39 a a
45 45 a b
21 32 b b
7 43 a b
14 48 a b
14 33 a b
39 44 a a
9 36 b b
4 23 b b
9 42 b b
41 41 b a
30 47 a b
8 42 b a
14 38 b b
3 15 a a
35 47 b b
14 34 a b
38 43 a b
1 35 b a
16 28 b a
aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaabbbbbbbbbbb
89 29
babaabaaabaaaababbbbbbbabbbaaaaababbaababababbababaaabbababaaabbbbaaabaaaaaabaaabaabbabab
39 70 b b
3 56 b b
5 22 b a
4 39 a b
41 87 b b
34 41 a a
10 86 a b
29 75 a b
2 68 a a
27 28 b b
42 51 b a
18 61 a a
6 67 b a
47 63 a a
8 68 a b
4 74 b a
19 65 a b
8 55 a b
5 30 a a
3 65 a b
16 57 a b
34 56 b a
1 70 a b
59 68 b b
29 57 b a
47 49 b b
49 73 a a
32 61 b b
29 42 a a
bbbbbbbbbbbbbbbbbbbbbbbbbbbbaaaaaaaaaaaaaaaaaaaaaaaaaaaaabbbbbbbbbbbbbaaaabbbbbbbbbbbbbab
59 14
fbebcfabdefbaaedcefdeecababcabebadfbccaaedaebfdaefdbbcbebbe
5 32 e f
8 46 e e
31 43 e f
3 10 e a
53 54 f d
55 59 d a
39 58 e b
54 56 f a
9 40 b e
28 37 d a
7 35 e b
7 56 c f
23 26 e a
15 44 e d
fbabcfabdffbaafdfffdfffababfabfbaafdffaafdabbfdabfdbbfbbbbe
7 17
bbaabab
3 5 a b
5 7 a a
5 5 a a
4 4 b a
7 7 a a
5 6 b b
1 3 b a
6 7 a b
4 6 a b
6 6 a a
2 4 b a
1 7 b a
4 6 b b
2 5 b b
2 5 a b
1 4 a a
4 4 b a
abbabaa
100 1
debaaagbfdgehagadabfgheegggfghghgeeeabgceffeffggcbcegfgebbdhebhfagcgadcbdbabddbcadgbgdebdfehceehcaef
13 99 f c
debaaagbfdgehagadabcgheegggcghghgeeeabgcecceccggcbcegcgebbdhebhcagcgadcbdbabddbcadgbgdebdcehceehcaef
1 1
a
1 1 a b
b
100 1
aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa
1 100 a b
bbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbb
2 2
aa
1 2 a b
1 2 b c
cc
3 3
aaa
1 3 a b
1 3 b c
1 3 c d
ddd
2 2
aa
2 2 a b
1 1 a b
bb
x,y=[int(x) for x in input().split()]
a=input()
k=list(a)
for _ in range(y):
    p,q,r,s=[str(x) for x in input().split()]
    e=int(p)
    f=int(q)
    for i in range(e-1,f):
        if(k[i]==r):
            k[i]=s
print("".join(k))
