#include <iostream>
using namespace std;

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

    if((abs(x1 - x2) == 1 and abs(y1 - y2) == 2) or (abs(x1 - x2) == 2 and abs(y1 - y2) == 1)) {
        cout << "DA" << endl;
    }
    else {
        cout << "NE" << endl;
    }

    return 0;

}