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

int main()
{
    string A, B;
    cin >> A >> B;
    sort(A.begin(), A.end());
    sort(B.begin(), B.end());
    if (A == B)
    {
        cout << "YES";
    }
    else
    {
        cout << "NO";
    }
}