#include<iostream>
#include<vector>
#include<algorithm>
#include<cstdio>
using namespace std;
int main(){
    int A1,B1,C1,A2,B2,C2;
    scanf("%d.%d.%d",&A1,&B1,&C1);
    scanf("%d.%d.%d",&A2,&B2,&C2);
    if(A1>A2){
        cout << "YES";
    }
    else if(A1==A2){
        if(B1>B2){
            cout << "YES";
        }
        else if(B1==B2){
            if(C1>=C2)  cout << "YES";
            else    cout << "NO";
        }
        else{
            cout << "NO";
        }
    }
    else    cout << "NO";
    return 0;
}