Program Cronometro ;
var h,m,s:integer;
Begin
  readln(h,m,s);
  while(h<>-1)do
  begin
    while(m<>-1)do
    begin
      while(s<>-1)do
      begin
        clrscr();
        writeln(h,':',m,':',s);
        delay(1000);
        s:=s-1;
      end;
      m:=m-1;
      s:=59;
    end;
    h:=h-1;
    m:=59;
  end;
  h:=0;
  writeln(h,':',m,':',s);
End.