import sequtils,strutils
var
    A = stdin.readline
    B = stdin.readline
    cnt : array[ord('a')..ord('z'),int]
for i,a in A:
    cnt[ord(a)] += 1
    cnt[ord(B[i])] -= 1
var flag : bool
for i in cnt:
    if i != 0:
        flag = true
        break
if flag:
    echo "NO"
else:
    echo "YES"