Definition: In this task, you are given an input list A. You need to convert all the alphabets in the list with a number representing their position in the English alphabet. E.g., replace A by 1, B by 2, a by 1, b by 2, and so on.
Input: ['6873', '5863', '5343', '5495', 'G', '8425', '5545', 'v', 'M', 'n', '963']

6873, 5863, 5343, 5495, 7, 8425, 5545, 22, 13, 14, 963