#include <bits/stdc++.h>
using namespace std;
typedef long long ll;
const double PI = acos(-1);
const ll MOD = 1000000007;

int main() {
  string A,B; cin >> A >> B;
  sort(A.begin(),A.end());
  sort(B.begin(),B.end());
  
  if (A == B) cout << "YES" << endl;
  else cout << "NO" << endl;
}