#include <bits/stdc++.h>
using namespace std;


int main(){
  string A,B;
  cin >> A >> B;
  int N = A.size();
  vector<char> a(N),b(N);
  for(int i=0;i<N;i++) a[i] = A[i];
  for(int i=0;i<N;i++) b[i] = B[i];
  sort(a.begin(),a.end());
  sort(b.begin(),b.end());
  bool flag = true;
  for(int i=0;i<N;i++) if(a[i] != b[i]) flag = false;
  if(flag) cout << "YES" << endl;
  else cout << "NO" << endl;
}