Change input value by multiple buttons


I want to create simple input field where user can write text by pressing buttons. Example:

There is buttons which are letters like A B C. When user press A button the input value changes to A. Then user press B button input value changes to AB and so on.

How I can create this method? Now if I press A the input value changes to A and after I press B it overrides the A and only shows B.

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