How do I delete last character from sprite font object?

How on button pressed to remove the last character from a sprite font? There's an append action (Append Text), but no way to remove a letter.

This is pretty much what I want to do:

Variable = "Value"
Text = Variable
Letter = "Q"

On Button A pressed -> Text -> Append Letter
                    -> System -> Set Variable to TextSprite.Text
On Button B pressed -> Text -> Remove Last Letter?
                    -> System -> Set Variable to TextSprite.Text

// On A pressed will output "ValueQ" and I need on each B press to remove one letter from the back
[/code:3hv1bxii]

If I understood correctly ...

Spritefont set text to.............left(SpriteFont.Text,len(SpriteFont.Text)-1)

left(text, count)

Return the first count characters of text.

len(text)

Return the number of characters in text.

Yes, thank you! That's works like a charm.