#include <bits/stdc++.h>

using namespace std;

int main()
{
    int x1,y1,x2,y2;
    cin >> x1 >> y1 >> x2 >> y2;
    if(x1 ==  x2 || y1 == y2)
        cout << "YES";
    else
        cout << "NO";
    return 0;
}