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: ['7157', '5339', 'g', 'T', '4939', '3853', '8781', 'b', '5527', 'V', 'E', '6331', '6477', 'M', '3219', '3353', '3051', '9097', 'b', '2391', '4915', '9523', '6543', '3813']

7157, 5339, 7, 20, 4939, 3853, 8781, 2, 5527, 22, 5, 6331, 6477, 13, 3219, 3353, 3051, 9097, 2, 2391, 4915, 9523, 6543, 3813