import sys
input = sys.stdin.readline
s=input().rstrip()
t=input().rstrip()
li1 = [0] * 26
for ss in s:
    li1[ord(ss) - ord('a')] += 1
li2 = [0] * 26
for tt in t:
    li2[ord(tt) - ord('a')] += 1
if li1 == li2:
    print('YES') 
else:
    print('NO')