#include <stdio.h>

#include <string.h>

#include <string>

#include <iostream>

#include <algorithm>

#include <map>

using namespace std;

int x[],y[];

int main()

{

    string a,b;

    while (cin >> a >> b)

    {

        bool f = ;

        memset(x,,sizeof(x));

        memset(y,,sizeof(y));

        for (int i = ;i < a.length();i++)

        {

            x[a[i]]++;

            y[b[i]]++;

        }

        sort(x,x+);

        sort(y,y+);

        for (int i = ;i < ;i++)

        {

            if (x[i] != y[i])

            {

                f = ;

                break;

            }

        }

        if (f) cout << "NO\n";

        else cout << "YES\n";

        }

    return ;

}