#include <iostream>

using namespace std;

int main()
{
    int H, W;
    cin >> H >> W;
    int X, Y;
    cin >> X >> Y;
    if (X >= 1 and X <= H and Y >= 1 and Y <= W)
    {
        cout << "DA" << endl;
    }
    else {cout << "NE" << endl;}
    return 0;
}