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: ['H', '219', 'N', 'Y', '9289', 'M', 'V', '9189', '1589', 'L', 'a', '4923', 'p', '4287', 'v', 'a', 'T', 'i', 'L']

8, 219, 14, 25, 9289, 13, 22, 9189, 1589, 12, 1, 4923, 16, 4287, 22, 1, 20, 9, 12