#include <bits/stdc++.h>
#define int long long
#define double long double
using namespace std;
const int MOD = 1000000007;
const int INF = 1e14;
using Graph = vector<vector<int>>;

signed main(){
  string S, T;
  cin >> S >> T;
  map<char, int> Scnt;
  map<char, int> Tcnt;
  for( int i = 0; i < S.size(); i++ ) Scnt[S[i]]++;
  for( int i = 0; i < T.size(); i++ ) Tcnt[T[i]]++;

  for( char i = 'a'; i <= 'z'; i++ ){
    if( Scnt[i] != Tcnt[i] ){
      cout << "NO" << endl;
      return 0;
    }
  }
  cout << "YES" << endl;
}