def main():

  nyuryoku_1 = str(input())
  nyuryoku_2 = str(input())
  nyuryoku_1_dict = {}
  nyuryoku_2_dict = {}
  nyuryoku_1_list = list(nyuryoku_1)
  nyuryoku_2_list = list(nyuryoku_2)
  for i in nyuryoku_1_list:
    nyuryoku_1_dict[i] = 0
  for i in nyuryoku_1_list:
    nyuryoku_1_dict[i] += 1
  for i in nyuryoku_2_list:
    nyuryoku_2_dict[i] = 0
  for i in nyuryoku_2_list:
    nyuryoku_2_dict[i] += 1
  if nyuryoku_1_dict == nyuryoku_2_dict:
    print("YES")
  else:
    print("NO")

if __name__ == '__main__':
  main()