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: ['i', '1441', '397', 'S', '8833', '9829', 'g', 'U', 'W', '9651', '9403', '7013', '8445', 'D', 'M']

9, 1441, 397, 19, 8833, 9829, 7, 21, 23, 9651, 9403, 7013, 8445, 4, 13