#include <bits/stdc++.h>

using i64 = long long;
using u64 = unsigned long long;
using u32 = unsigned;

using u128 = unsigned __int128;
using i128 = __int128;

int main() {
    std::ios::sync_with_stdio(false);
    std::cin.tie(nullptr);

    int a, b;
    std::cin >> a >> b;

    while (a) {
        int r = a % 10;
        int x = b % 10;
        if (x > r) {
            std::cout << "No";
            return 0;
        }
        a /= 10;
        b /= 10;
    }

    if (b != 0) std::cout << "No";
    else std::cout << "Yes";

    return 0;
}