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: ['m', '3899', '8035', '2917', 'I', '2755', 'O', '9417']

13, 3899, 8035, 2917, 9, 2755, 15, 9417