var
n:integer;
begin
readln(n);
writeln('---');
case n of
1..10:writeln('1 decade');
11..20:writeln('2 decade');
21..30:writeln('3 decade');
end;
end.
var
n:integer;
begin
readln(n);
writeln('---');
case n of
1..10:writeln('1 decade');
11..20:writeln('2 decade');
21..30:writeln('3 decade');
end;
end.