prefix

//#include<bits/stdc++.h>
#include<iostream>
#include<fstream>
#include<vector>
#include<string>
#include<algorithm>

#define long long long
#define nln '\n'

const long BASE = 311;
const long MOD = 1e9 + 3;

using namespace std;

// GLobal variables: f1, f2, st1, st2

fstream f1,f2;

inline void openf()
{
    f1.open("prefix.inp", ios:: in);
    f2.open("prefix.out", ios:: out);
}

inline void closef()
{
    f1.close();
    f2.close();
}

string st1, st2;

long hst1 = 0;
long hst2 = 0;

void data()
{
    f1.tie(0)->sync_with_stdio(0);
    f2.tie(0)->sync_with_stdio(0);
    cin >> st1 >> st2;
    for (long i = 0; i != st1.size(); ++i)
    {
        hst2 = ((hst2*BASE) + st2[i] - 'a') % MOD;
        hst1 = ((hst1*BASE) + st1[i] - 'a') % MOD;
    }
}

void process()
{
    if (hst1 == hst2)
        cout << "Yes" << nln;
    else
        cout << "No" << nln;
}

void view()
{
}

int main()
{
    openf();
    data();
    process();
    view();
    closef();
    return 0;
}