#include <bits/stdc++.h>
#define rep(i,n)for(long long i=0;i<(n);i++)
using namespace std;
typedef unsigned long long ull;
typedef long long ll;
const ll INF=1e18;
const int MOD=1e9+7;
const double pi=acos(-1);

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;
}