dame

#include <iostream>
using namespace std;

int main()
{
	int x1, y1, x2, y2;
	cin >> x1 >> y1 >> x2 >> y2;

	if ((x1 >= 0 && x1 <= 7) && (x2 >= 0 && x2 <= 7) && (y1 >= 0 && y1 <= 7) && (y2 >= 0 && y2 <= 7)) {

		if (x1 == x2 || y1 == y2 || (x1 + y1 == x2 + y2) || (abs(x1 - y1) == abs(x2 - y2))) {
			cout << "da";
		}

		else {
			cout << "ne";
		}

	}
	else {
		cout << "ne";
	}



}