#include<bits/stdc++.h>
using namespace std;
#define ll long long
#define endl "\n"

int main() {
    string a, b;
    cin >> a >> b;

    sort(a.begin(), a.end());
    sort(b.begin(), b.end());
    bool flag = true;
    for (int i = 0; i < a.size(); ++i) {
        if (a[i] != b[i]) {
            flag = false;
            break;
        }
    }
    cout << (flag ? "YES" : "NO") << endl;

    return 0;
}