program masuvu_1_10;

{$APPTYPE CONSOLE}

uses
  SysUtils;

var
  a:array[1..10000] of integer ;
  c,k,i,n:integer;
begin
  readln(n);
  k:=0;
  for i:=1 to n do
  readln(a[i]);
  for i:=1 to n-1 do
  if a[i]*(-1)=a[i+1] then
  k:=k+1;
  if k=0 then
  writeln('ni')
  else
  writeln('tak');
  readln;
end.