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', '3181', '9903', 'V', '2405', '2019', 'd']

23, 3181, 9903, 22, 2405, 2019, 4