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: ['4729', '9999', 'G', 'B', 'M', 'k', '6223', 'd']

4729, 9999, 7, 2, 13, 11, 6223, 4