#include <bits/stdc++.h>
using namespace std;
constexpr int inf = 1073741823;
constexpr long long linf = 0xfffffffffffffff;
using ll = long long;
using ld = long double;

int main() {
    std::ios::sync_with_stdio(false);
    std::cin.tie(nullptr);
    string a, b; cin >> a >> b;
    bool f = true;
    if(a.size() < b.size()) {
        cout << "No" << endl;
        return 0;
    }
    reverse(a.begin(), a.end());
    reverse(b.begin(), b.end());
    for(int i = 0; i < b.size(); i++) {
        if(a[i] - '0' < b[i] - '0') f = false;
    }
    if(f) {
        cout << "Yes" << endl;
    }else {
        cout << "No" << endl;
    }
}