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: ['D', 's', 'B', 'W', 'M', 'f', '6445', '7571', '7157', '3505', '2275', 'e', 'm', '6961', '4567', 'm', 'u', '9235', '1563', 'X', '7619', 'n', '301', '2637', '2529', 'i', 'I', 'O', 'd', 'C', '7055']

4, 19, 2, 23, 13, 6, 6445, 7571, 7157, 3505, 2275, 5, 13, 6961, 4567, 13, 21, 9235, 1563, 24, 7619, 14, 301, 2637, 2529, 9, 9, 15, 4, 3, 7055