2d array part 2

Alright so I have code for creating an 8 by 8 grid where there are 3 random mice and a cat that always starts at the bottom left. The objective is to enter cordinates for the cat to move to the location of the mice and eat them one by one. How do i update my grid so that when i enter say 3,5 (the location of the mouse) the cat (C) replaces the letter (M) and the old location starting location of the cat becomes(.) ?
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