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

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

    int A,B; cin >> A >> B;
    bool yes = true;
    for(int i=0; i<10; i++){
        int a = A%10,b = B%10;
        if(a < b) yes = false;
        a /= 10; b /= 10;
    }
    if(yes) cout << "Yes" << endl;
    else cout << "No" << endl;
 }