#include<iostream>
#include<iomanip>
#include<cmath>
#include<string>
#include<algorithm>
#include<vector>
#include<math.h>
#include<stack>
using namespace std;
int main(void){
    int A0, B0, C0, A1, B1, C1;
    scanf("%d.%d.%d", &A0, &B0, &C0);
    scanf("%d.%d.%d", &A1, &B1, &C1);
    if(A0 > A1) {
        cout << "YES" << endl;
    }else if(A0 < A1){
        cout << "NO" << endl;
    }
    if(A0 == A1){
        if(B0 > B1) {
        cout << "YES" << endl;
    }else if(B0 < B1){
        cout << "NO" << endl;
    }
        if(B0 == B1){
            if(C0 > C1) {
        cout << "YES" << endl;
    }else if(C0 < C1){
        cout << "NO" << endl;
    }
        }
    }
    return 0;
}