#include <bits/stdc++.h>
#define rep(i, n) for (int i = 0; i < (n); i++)
using namespace std;
typedef long long ll;

int main(){
    string a, b;
    cin >> a >> b;
    int m = 0;
    sort(a.begin(), a.end());
    sort(b.begin(), b.end());
    if(a == b){
        cout << "YES" << endl;
    }else{
        cout << "NO" << endl;
    }
    return 0;
}