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: ['9891', '8283', 'I', 'B', 'F', '8567', '87', 'Q', '9465', '4873', 'M', 'q', 'P', 'B', 'B', '9471']

9891, 8283, 9, 2, 6, 8567, 87, 17, 9465, 4873, 13, 17, 16, 2, 2, 9471