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: ['5223', '3529', 'k', 'o', 'K', '6357', '6631', '6471', 'a']

5223, 3529, 11, 15, 11, 6357, 6631, 6471, 1