#include<iostream>
#include<iomanip>
#include<cmath>
#include<string>
#include<algorithm>
#include<vector>
#include<math.h>
#include<stack>
using namespace std;
int main(void){
    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]){
            if(i == A.size() - 1){
                cout << "YES" << endl;
                break;
            }
            continue;
        }else{
            cout << "NO" << endl;
            break;
        }
    }
        
    return 0;
}