#include<bits/stdc++.h>
using namespace std;
int main(){
    vector<int>V[2];
    for(int i=0;i<2;i++){
        int a,b,c;
        scanf("%d.%d.%d",&a,&b,&c);
        V[i].push_back(a);
        V[i].push_back(b);
        V[i].push_back(c);
    }
    if(V[0]>=V[1])puts("YES");
    else puts("NO");
    return 0;
}