from collections import defaultdict

def main():
  A = input()
  B = input()

  a_dict = defaultdict(lambda: 0)
  for a in A:
    a_dict[a] += 1

  b_dict = defaultdict(lambda: 0)
  for b in B:
    b_dict[b] += 1

  if a_dict == b_dict:
    print("YES")
  else:
    print("NO")

main()