program Project6;
{$APPTYPE CONSOLE}
var a,b,c,d:integer;
begin
writeln('Vvedit storony chotyrykutnyka a,b,c,d');
readln(a,b,c,d);
if (a=b) and (b=c) and (c=d) and (d=a) then
writeln('Rivnostoronnyi') else
writeln('Trykutnyk ne rivnostoronnyi');
readln;
end.