How can I add a Backspace button in this code?

Question

https://code.sololearn.com/WYl1qOdrsVAE/?ref=app

Answer 1

<input class="bt" type="button" name="backspace" value=" &lt;- " onclick="Calc.Input.value = Calc.Input.value.slice(0,Calc.Input.value.length-1)">

Answer 2

thank you