program ggg;
var c,a,b,d,p,x2,S:integer;
j:string;
Begin
j:='net';
for a:=1 to 9 do
for b:=0 to 9 do
for c:=0 to 9 do
for d:=0 to 9 do begin
S:=a*1000+b*100+c*10+d;
p:=a*a*a*a*a+b*b*b*b*b+c*c*c*c*c+d*d*d*d*d;
if S=p then
j:='est';
end;
writeln(j);
readln;
end.