#include <iostream>
#include <vector>
#include <algorithm>
#include <cmath>
#include <iomanip>
#include <stack>
#include <algorithm>
#include <string>
#include <map>
#include <iterator>
#include <set>
#include <queue>

using namespace std;


int main() {

    string A, B;
    cin >> A >> B;

    vector<int> as(26, 0);
    vector<int> bs(26, 0);

    for (int i = 0; i < A.size(); ++i) {
        as[A[i] - 'a'] += 1;
    }

    for (int i = 0; i < B.size(); ++i) {
        bs[B[i] - 'a'] += 1;
    }

    bool ok = true;
    for (int i = 0; i < 26; ++i) {
        if (as[i] != bs[i]) {
            ok = false;
            break;
        }
    }

    if (ok) {
        cout << "YES" << endl;
    } else {
        cout << "NO" << endl;
    }

    return 0;
}