var alpha:real;
begin
read(alpha);
if alpha > 90 then write("tupougolnyj");
if alpha = 90 then write("prjamougolnyj");
if alpha < 90 then write("ostrougolnyj");
end.
var alpha:real;
begin
read(alpha);
if alpha > 90 then write("tupougolnyj");
if alpha = 90 then write("prjamougolnyj");
if alpha < 90 then write("ostrougolnyj");
end.