#include <bits/stdc++.h>
using namespace std;

void fast_io() {
	ios_base::sync_with_stdio(false);
	cin.tie(nullptr);
}

int main() {
	fast_io();
	string a, b;
	cin >> a >> b;
	if (a.size() < b.size()) {
		cout << "No" << endl;
		return 0;
	}
	reverse(a.begin(), a.end());
	reverse(b.begin(), b.end());
	while (b.size() < a.size()) {
		b.push_back('0');
	}
	for (int i = 0; i < a.size(); i++) {
		if (a[i] < b[i]) {
			cout << "No" << endl;
			return 0;
		}
	}
	cout << "Yes" << endl;
}