How do I make a textbox with a number at the end all time?

System -->  Compare two values
				int(left(TextBox.Text, 1))
				?
				9

TextBox --> Set Text: "9"&TextBox.Text[/code:27rympyd]

And the result of course is to have the number "9" at first all time. What can i do, when i write anything to have the number "9" at the end all time? Thanks!