#include <bits/stdc++.h>

using namespace std;

int main()
{
  string str1, str2;
  cin >> str1 >> str2;

  vector<char> v1;
  vector<char> v2;

  for (int i = 0; i < str1.length(); ++i)
  {
    v1.push_back(str1[i]);
    v2.push_back(str2[i]);
  }

  sort(v1.begin(), v1.end());
  sort(v2.begin(), v2.end());

  for (int i = 0; i < v1.size(); ++i)
  {
    if (v1[i] != v2[i])
    {
      cout << "NO" << endl;
      exit(0);
    }
  }

  cout << "YES" << endl;
}