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

int main(){

    cin.tie(nullptr);
    ios::sync_with_stdio(false);

    ll A,B;
    cin>>A>>B;
    for(int i=0;i<=20;i++){
        if(A%10<B%10){
            cout<<"No"<<endl;
            return 0;
        }
        A/=10;
        B/=10;
    }
    cout<<"Yes"<<endl;
    
}