#include <bits/stdc++.h>

using ll = long long;

using namespace std;

int main()
{
    ios::sync_with_stdio(false);
    cin.tie(nullptr);

    string a,b;
    cin >> a >> b;

    sort(a.begin(),a.end());
    sort(b.begin(),b.end());

    if (a==b)
        cout << "YES\n";
    else
        cout << "NO\n";

    return 0;
}