#include <iostream>
#include <vector>
#include <algorithm>

#define ALL(x) (x).begin(),(x).end()

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);
    string ans = "NO";
    if(a1 > a2)ans = "YES";
    if(a1 == a2 && b1 > b2)ans = "YES";
    if(a1 == a2 && b1 == b2 && c1 >= c2)ans = "YES";
    cout << ans << endl;
    return 0;
}