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: ['8563', '5787', 'u', '9653', 'k', '6793', '9443', 'm', 'e']

8563, 5787, 21, 9653, 11, 6793, 9443, 13, 5