#include <iostream>
using namespace std;

int main() {
	
	int x1;
	int y1;
	cin >> x1 >> y1;
	
	int x2, y2;
	cin >> x2 >> y2;
	
	if (y1 == y2 || x1 == x2) {
		cout << "YES";
	} else {
		cout << "NO";
	}

	
	return 0;
}