#include <bits/stdc++.h>

using namespace std;

#define REP(i,a,b) for(int i=a;i<(int)b;i++)
#define rep(i,n) REP(i,0,n)

int main() {
  
  string s, t;
  cin >> s >> t; sort(s.begin(), s.end()); sort(t.begin(), t.end());
  if(s == t) { cout << "YES\n"; } else { cout << "NO\n"; }
  
  return 0;
}