#include <algorithm>
#include <iostream>
#include <fstream>
#include <cstdio>
#include <string>
#include <vector>
#include <stack>
#include <queue>
#include <cmath>
#include <functional>
#include <cassert>
#include <iomanip>
#include <array>
#include <time.h>
#include <limits.h>
#include <numeric>
#define debug(x) cout<<#x<<": "<<x<<endl
#define rep(i,n) for (int i=0;i<(n);i++)
#define FOR(i,a,b) for (int i=(a);i<=(b);i++)
using namespace std;


void solve(){
#ifdef _WIN32
    istream &cin = ifstream("input.txt");
#endif
    int x1 = 0, x2 = 0, x3 = 0, y1 = 0, y2 = 0, y3 = 0;
    scanf("%d.%d.%d\n", &x1, &x2, &x3);
	scanf("%d.%d.%d\n", &y1, &y2, &y3);
	if (x1 > y1 || x2 > y2 || x3 > y3) cout << "YES" << endl;
	else cout << "NO" << endl;
}

int main(){
    cin.tie(0);
    ios::sync_with_stdio(false);

    solve();
    return 0;
}