#include <iostream>
#include <string>
#include <vector>
#include <algorithm>
#include <queue>
#include <cmath>
#include <climits>
#include <iomanip>
#include <set>
#include <map>
using namespace std;
typedef long long ll;
int main(){
    string s,t;
    cin >> s >> t;
    sort(s.begin(),s.end());
    sort(t.begin(),t.end());
    if(s == t)cout << "YES" << endl;
    else cout << "NO" << endl;
}