#include <bits/stdc++.h>
using namespace std;

int main()
{
    string s, t;
    cin >> s >> t;
    
    sort(s.begin(), s.end());
    sort(t.begin(), t.end());
    
    bool flag = true;
    
    for (int i = 0; i < s.size(); ++i) {
        if (s[i] == t[i]) continue;
        else {
            flag = false;
            break;
        }
    }
    
    if (flag) cout << "YES" << "\n";
    else cout << "NO" << "\n";
    
    return 0;
}