#include<iostream>
using namespace std;
int main()
{
    int old_ver[3],chk_ver[3];
    old_ver[0] = 35;
    scanf("%d.%d.%d",&old_ver[0],&old_ver[1],&old_ver[2]);
    scanf("%d.%d.%d",&chk_ver[0],&chk_ver[1],&chk_ver[2]);
    for(int i=0;i<3;i++){
        if(old_ver[i]<chk_ver[i]){
            cout<<"NO"<<endl;
            break;
        }
        else if(old_ver[i]>chk_ver[i]){
            cout<<"YES"<<endl;
            break;
        }
        else if(i !=2)continue;
        else cout<<"YES"<<endl;
    }
    return 0;
}