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: ['J', '579', '8819', 'M', 'A', '4845', '9655', '7411', 'a', '1987', 'L', '7925']

10, 579, 8819, 13, 1, 4845, 9655, 7411, 1, 1987, 12, 7925