#include<iostream>
#include<stdio.h>
#include<vector>
#include<algorithm>

using namespace std;

int main(){

    int x[3], y[3];

    scanf("%d.%d.%d", &x[0], &x[1], &x[2]);
    scanf("%d.%d.%d", &y[0], &y[1], &y[2]);

    bool flag = true;
    if(x[0]<y[0]){
        flag = false;
    }else if(x[0]>y[0]){
        flag = true;
    }else{
        if(x[1]<y[1]){
            flag = false;
        }else if(x[1]>y[1]){
            flag = true;
        }else{
            if(x[2]<y[2]){
                flag = false;
            }else if(x[2]>y[2]){
                flag = true;
            }else{
                flag = true;
            }
        }
    }

    if(flag){
        cout<< "YES"<< endl;
    }else{
        cout<< "NO"<< endl;
    }

    return 0;
}