#include <iostream>
#include <vector>
#include <algorithm>
#include <cmath>
#include <iomanip>
#include <stack>
#include <algorithm>
#include <string>
#include <map>
#include <iterator>
#include <set>
#include <queue>

using namespace std;

vector<string> split(string s, const string &delimiter) {
    size_t pos_start = 0, pos_end, delim_len = delimiter.length();
    string token;
    vector<string> res;

    while ((pos_end = s.find(delimiter, pos_start)) != string::npos) {
        token = s.substr(pos_start, pos_end - pos_start);
        pos_start = pos_end + delim_len;
        res.push_back(token);
    }

    res.push_back(s.substr(pos_start));
    return res;
}


int main() {

    string s1, s2;
    cin >> s1 >> s2;

    vector<string> ss1 = split(s1, ".");
    vector<string> ss2 = split(s2, ".");
    string result = "NO";
    for (int i = 0; i < 3; ++i) {
        if (stoi(ss1[i]) >= stoi(ss2[i])) {
            result = "YES";
            break;
        } else {
            break;
        }

    }

    cout << result << endl;


    return 0;
}