#include <bits/stdc++.h>

using namespace std;

int main(){
    int a,b,c;
    int d,e,f;
    scanf("%d.%d.%d",&a,&b,&c);
    scanf("%d.%d.%d",&d,&e,&f);
    if(a<d||(a==d&&b<e)||(a==d&&b==e&&c<f)){
        cout<<"NO"<<endl;
    }else{
        cout<<"YES"<<endl;
    }
    return 0;
    
}