#include<bits/stdc++.h>

using namespace std;

int main(){
    int a,b;
    cin >> a >> b;
    bool ans = 1;
    while(a == 0 && b == 0){
        if(a % 10 < b % 10)ans = 0;
        a /= 10;
        b /= 10;
    }
    if(ans)cout << "Yes" << endl;
    else cout << "No" << endl;
    return 0;
}