#include <bits/stdc++.h>
#define INF 990000000
//
using namespace std;


vector<string> split(string str, char del) {
    int first = 0;
    int last = str.find_first_of(del);
 
    vector<string> result;
 
    while (first < str.size()) {
        string subStr(str, first, last - first);
 
        result.push_back(subStr);
 
        first = last + 1;
        last = str.find_first_of(del, first);
 
        if (last == string::npos) {
            last = str.size();
        }
    }
 
    return result;
}

int main() {

string s;
cin>>s;
vector<string> a=split(s,'.');

string t="";
for(int i=0;i<3;i++){
t+=a[i];
}
int beg=stoi(t);
cin>>s;
a.clear();
a=split(s,'.');
string tt="";
for(int i=0;i<3;i++){
tt+=a[i];
}
int e=stoi(t);

if(t>tt)
cout <<"YES"<<endl;
else
cout <<"NO"<<endl;

}