#define _USE_MATH_DEFINES
#include <algorithm>
#include <cstdio>
#include <functional>
#include <iostream>
#include <cfloat>
#include <climits>
#include <cstring>
#include <cmath>
#include <map>
#include <queue>
#include <set>
#include <sstream>
#include <stack>
#include <string>
#include <time.h>
#include <unordered_map>
#include <vector>
using namespace std;

typedef long long ll;
typedef unsigned long long ull;
typedef pair<int, int> i_i;
typedef pair<ll, int> ll_i;
typedef pair<double, int> d_i;
typedef pair<ll, ll> ll_ll;
typedef pair<double, double> d_d;
struct edge { ll B, T, F, P; };

ll MOD = 1234567891;
ll _MOD = 1000000009;
double EPS = 1e-10;
int INF = INT_MAX / 10;

int main() {
	vector<int> v1(3), v2(3);
	scanf("%d.%d.%d", &v1[0], &v1[1], &v1[2]);
	scanf("%d.%d.%d", &v2[0], &v2[1], &v2[2]);
	cout << (v1 >= v2 ? "YES" : "NO") << endl;
}