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

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;
    }
}