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: ['275', 'v', 'q', 'P', '9443', 'Q', '8699', 'B']

275, 22, 17, 16, 9443, 17, 8699, 2