program Zatvorky;
var s:string;
    a,p:integer;
begin
readln (s);
a:=0;
p:=0;
repeat
a:=a+1;
if s[a]='(' then p:=p+1;
if s[a]=')' then p:=p-1;
until (a=length(s)) or (p<0);
if p<>0 then writeln ('nie je')
             else writeln ('je');
end.