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: ['759', 'M', '8411', '6065', '8121', 'g', '7705', 'C', '8951', '5565', 'b', 'W']

759, 13, 8411, 6065, 8121, 7, 7705, 3, 8951, 5565, 2, 23