How to remove last letter of the text box when btn click?

I need to Remove the first or last letter of my textbox in my “Call Dialer App”
I don’t understand how to do it?? Can anyone explain me??

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Use this block

bild

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but how to remove??

how to do it??

in the blocks
text = textbox1. text
start= 1(use maths component for that)

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Your title does not matches your question.
You want to remove first letter or last letter???

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last letter of the text box

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