program test_readkey;
uses crt;
var
  c : char;
begin
  c:=readkey;
  case c of
    #8 : writeln('backspace');
    #9 : writeln('tab');
    #13: writeln('enter');
    #27: writeln('escape');
    #32: writeln('space');
    else writeln('other');
  end;
end.