The translation from the Berland language into the Birland language is not an easy task. Those languages are very similar: a berlandish word differs from a birlandish word with the same meaning a little: it is spelled (and pronounced) reversely. For example, a Berlandish word code corresponds to a Birlandish word edoc. However, it's easy to make a mistake during the «translation». Vasya translated word *s* from Berlandish into Birlandish as *t*. Help him: find out if he translated the word correctly.
The first line contains word *s*, the second line contains word *t*. The words consist of lowercase Latin letters. The input data do not consist unnecessary spaces. The words are not empty and their lengths do not exceed 100 symbols.
#!/usr/bin/env python
# coding=utf-8

char_list = []
for i in range(26):
    char_list.append([0, 0])
input_f = input()
input_s = input()
for i in list(input_f):
    char_list[ord(i) - ord('a')][0] += 1
for i in list(input_f):
    char_list[ord(i) - ord('a')][1] += 1
is_ok = True
for (f, s) in char_list:
    if f != s:
        is_ok = False
        break
if is_ok:
    if input_f == input_s:
        print('NO')
    else:
        print('YES')
else:
    print('NO')
