#include <iostream>
#include <algorithm>
using namespace std;
typedef long long ll;

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;
    }
    
    return 0;
}