#include "bits/stdc++.h"

using namespace std;

void solve()
{
	string a, b;
	cin >> a >> b;
	cout << (a + "0" == b ? "Yes" : "No") << endl;
}

int main(void)
{
	solve();
	//cout << "yui(*-v・)yui" << endl;
	return 0;
}