#include <bits/stdc++.h>

using namespace std;

int main() {
  string a, b;
  cin >> a >> b;
  sort(a.begin(), a.end());
  sort(b.begin(), b.end());
  for (int i = 0; i < a.size(); ++i) {
    if (a[i] != b[i]) {
      puts("NO");
      return 0;
    }
  }
  puts("YES");
  return 0;
}