#include <algorithm>
#include <iostream>
#include <string>

using namespace std;

static void setup()
{
    cin.tie(0);
    ios::sync_with_stdio(false);
}

static void run()
{
    string a, b;
    cin >> a >> b;

    std::sort(begin(a), end(a));
    std::sort(begin(b), end(b));
    const auto same = a == b;

    cout << (same ? "YES" : "NO") << endl;
}

int main(int argc, char **argv)
{
    setup();
    run();
    return 0;
}