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

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