You are given a string *q*. A sequence of *k* strings *s*<sub class="lower-index">1</sub>, *s*<sub class="lower-index">2</sub>, ..., *s*<sub class="lower-index">*k*</sub> is called beautiful, if the concatenation of these strings is string *q* (formally, *s*<sub class="lower-index">1</sub> + *s*<sub class="lower-index">2</sub> + ... + *s*<sub class="lower-index">*k*</sub> = *q*) and the first characters of these strings are distinct.

Find any beautiful sequence of strings or determine that the beautiful sequence doesn't exist.
The first line contains a positive integer *k* (1 ≤ *k* ≤ 26) — the number of strings that should be in a beautiful sequence. 

The second line contains string *q*, consisting of lowercase Latin letters. The length of the string is within range from 1 to 100, inclusive.
def output():
	print("YES")
	
	for st in ans:
		print(st)

k = int(input())
q = input()
n = len(q)

ans = []
used = set()
lim = 1
last = -1
for i in range(n):
	if q[i] not in used:
		if last != -1:
			lim += 1
			ans.append(q[last : i])
		used.add(q[i])
		last = i
	if lim == k:
		ans.append(q[i:])
		output()
		break
			
if lim < k:
	print("NO")