A=gets.chomp
B=gets.chomp


def narabikae(a, b)
  a1 = a.split("").sort!
  b1 = b.split("").sort!
  ret = "YES"
  for num in 0..a1.length
    if b1[num, 1] != a1[num, 1]
      ret = "NO"
    end
  end
  return ret
end

puts narabikae(A, B)