#include <bits/stdc++.h>
#define ll long long
#define pi (acos(-1))
using namespace std;
/*todos
 * prime num gen
 * for macro
 * */
int main()
{
    std::string a, b;
    cin >> a >> b;
    vector<int> m(1000, 0), n(1000, 0);
    for (auto &c : a) { m[c]++; }
    for (auto &c : b) { n[c]++; }

    for (int i = 0; i != 1000; ++i)
    {
        if (m[i] != n[i])
        {
            cout << "NO" << endl;
            return 0;
        }
    }
    cout << "YES" << std::endl;

    return 0;
}