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: ['W', 'M', 'y', 'E', 't', '8561', 'A', '657']

23, 13, 25, 5, 20, 8561, 1, 657