#include <bits/stdc++.h>
using namespace std;
using ll = long long;
const int INF = 1e9 + 10;
const ll INFL = 4e18;

int main() {
    string A, B;
    cin >> A >> B;
    ranges::reverse(A);
    ranges::reverse(B);

    while (A.size() < B.size()) A += '0';
    while (A.size() > B.size()) B += '0';

    for (int i = 0; i < (int)A.size(); i++) {
        if (A[i] < B[i]) {
            puts("No");
            return 0;
        }
    }

    puts("Yes");
}