uses crt;
var
a:array[1..100]of integer;
i,n,k:integer;
begin clrscr;
write('n=');
read(n);
k:=0;
for i:=1 to n do
begin
write('a[',i,']=');
read(a[i]);
end;
writeln;
for i:=1 to n do
if a[i]>a[i+1] then inc(k);
if k=n then writeln('DA') else writeln('NET');
readkey;
end.