#include <iostream>
using namespace std;
int main(){
    int n,m,s,p;
    cin>>n>>m>>s>>p;
    if((abs(n-s)==1 and abs(m-p)==2) or (abs(s-n)==2 and abs(p-m)==1) ){
        cout<<"DA"<<endl;

                }
                else{
                    cout<<"NE";
                }

    return 0;
}