#include <bits/stdc++.h>
using namespace std;
int main() {
    vector<tuple<int,int,int>> P;
    int A,B,C,i=2;
    char D;
    while(cin>>A>>D>>B>>D>>C)P.push_back({A,B,C});
    cout<<(P[0]>P[1]?"YES":"NO")<<endl;
}