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: ['U', '5223', '3841', 'O', '5039', 'w', '677', '65', 'r', 'e', '4235', '7769', '8655']

21, 5223, 3841, 15, 5039, 23, 677, 65, 18, 5, 4235, 7769, 8655