#include <iostream>
using namespace std;
int main(void){
    int a[3],b[3],i=0;
    bool c=false;
    scanf("%d.%d.%d%d.%d.%d",a,a+1,a+2,b,b+1,b+2);
    if(a[i]>b[i]){
        c=true;
    }else if(a[i]==b[i]){
        i++;
        if(a[i]>b[i]) c=true;
        else if(a[i]==b[i]&&a[i+1]>=b[i+1]) c=true;
    }
    if(c) cout<<"YES\n";
    else cout<<"NO\n";
    return 0;
}