#include <iostream>
#include <algorithm>
using namespace std;

int main() {
  // 入力
  string a, b;
  cin >> a >> b;

  sort(a.begin(), a.end());
  sort(b.begin(), b.end());

  // 解答
  cout << (a == b ? "YES" : "NO") << endl;

  return 0;
}