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', '993', '3537', '5887', 'X', '6441', 'i', 'k', '9043', '7403', '6793', 'B', 'C', 'E', '3357', '1705', 'n']

9, 993, 3537, 5887, 24, 6441, 9, 11, 9043, 7403, 6793, 2, 3, 5, 3357, 1705, 14