program r8_43;
uses crt;
const n=5;
var a:array[1..n,1..n] of integer;
      k,i,j:integer;
BEGIN
clrscr;
randomize;
for i:=1 to n do begin
 for j:=1 to n do begin
   a[i,j]:=random(100); write(a[i,j]:4,' ');
 end;
writeln;
end;
k:=0;
for i:=1 to n-1 do begin
  for j:=1 to n-1 do begin
   if ((a[i,j]=a[i+1,j])or(a[i,j]=a[i,j+1])) then k:=k+1;
 end;
end;
if k>0
  then writeln('est')
else writeln('net');
END.