isti kvadrant

#include <iostream>
using namespace std;

int main()
{
//      ax  ay  bx  by
	int x1, y1, x2, y2;
	cin >> x1 >> y1 >> x2 >> y2;

	bool x_check = (x1 >= 0 && x2 >= 0) || (x1 <= 0 && x2 <= 0);
	bool y_check = (y1 >= 0 && y2 >= 0) || (y1 <= 0 && y2 <= 0);


	if (x_check && y_check)
		cout << "da";

	else
		cout << "ne";


}