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: ['1393', 'M', '2425', '1103', '3215', 'd', 'a', 'T', 'l', '587']

1393, 13, 2425, 1103, 3215, 4, 1, 20, 12, 587