#include <iostream>
using namespace std;
int main(int argc, const char * argv[]) {
    int a, b, c, d;
    cin >> a >> b;
    cin >> c >> d;

    if(abs(a-c) == 2 && abs(b-d) == 1) {
        cout << "DA" <<endl;
    } else if(abs(a-c) == 1 && abs(b-d) == 2) {
        cout << "DA" <<endl;
    }
    else
        cout << "NE" <<endl;
}