15-207

#include <iostream.h>
int tc(int x){
    if(x<10)
        return 1;
    else
        if((x%10)>((x/10)%10))
            return tc(x/10);
        else
            return 0;
}
int main (){
    int x;
    cin>>x;
    if(tc(x))
        cout<<"DA";
    else
        cout<<"NU";
}