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: ['4205', 'G', '1413', '7645', '3521', 'E', 'W']

4205, 7, 1413, 7645, 3521, 5, 23