What have i do wrong or forget in my RightStr?

From: HiGate (trash.mail_at_swipnet.se)
Date: 04/30/04 

Date: Fri, 30 Apr 2004 12:23:11 +0200

What have i do wrong or forget?

procedure TForm1.Button1Click(Sender: TObject);
var s : string;
begin

s := 'ABOUT DELPHI PROGRAMMING';
s := RightStr(s,5);

// s = 'MMING'

end;

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