#include <iostream>
#include <vector>
#include <algorithm>

using namespace std;


int main() {
  std::cin.tie(0);
  std::ios::sync_with_stdio(false);

  string A, B;
  cin >> A;
  cin >> B;

  sort(A.begin(), A.end());
  sort(B.begin(), B.end());
  // cout << A << endl;
  // cout << B << endl;
  if(A == B)
    cout << "YES" << endl;
  else
    cout << "NO" << endl;

  return 0;
}