#No.69 文字を自由に並び替え
A = input()
B = input()
S = [chr(i) for i in range(97,97+26)] #小文字英字のリスト
p = 0

for n in S:
  m = A.count(n)
  n = B.count(n)
  if m == n:
    p = p + 1
  else:
    print('NO')
    break

if p == 26:
  print('YES')