# coding: utf-8
# Your code here!

A = input().strip()
B = input().strip()

countA = {}
countB = {}

for a in A:
    if not a in countA:
        countA[a] = 1
    else:
        countA[a] += 1

for b in B:
    if not b in countB:
        countB[b] = 1
    else:
        countB[b] += 1

if countA == countB:
    print("YES")
else:
    print("NO")