# -*- coding: utf-8 -*-

A = input()
B = input()

dict_A = {}
dict_B = {}
for char in A:
    if char not in dict_A:
        dict_A[char] = 1
    else:
        dict_A[char] += 1
for char in B:
    if char not in dict_B:
        dict_B[char] = 1
    else:
        dict_B[char] += 1

is_possible = True
for char in A:
    if (char not in dict_B) or (dict_A[char] != dict_B[char]):
        is_possible = False

if is_possible:
    print('YES')
else:
    print('NO')