enter text by clicking on letters which are sprite font or just sprites

hi, everyone, I have been hired to make an arcade gun game by a friend and since the game is controlled with a gun that uses the mouse I am limited in my controls now I want to let the player enter their name into the high score. and to do this by clicking on the letters now unfortunately I don't know how to do that I can set text when I click on a sprite text object but how do I make it just ADD the letter to the text

something like this but you click on the letters

Create an empty text variable.

At every "click" on the image with the letter, increase the string value:

Variable = Variable & Sprite.Letter

fantastic thanks mate

You are welcome :)