#include<iostream>
#include<string>
#include<algorithm>
#include<cctype>
#include<set>
#include<bitset>
#include<math.h>
#include<map>
#include<queue>
#include<iomanip>
using namespace std;

int main(){
    string a, b;
    cin >> a >> b;
    sort(a.begin(), a.end());
    sort(b.begin(), b.end());
    for (int i = 0; i < a.size(); i++){
        if(a[i] != b[i]){
            cout << "NO" << endl;
            return 0;
        }
    }
    cout << "YES" << endl;
}