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: ['i', '4753', '6961', '1607', '7787', '779', '8733', 'i', '1075', 'q', '9037', 'b', '7423', 'J', '7289', '8219']

9, 4753, 6961, 1607, 7787, 779, 8733, 9, 1075, 17, 9037, 2, 7423, 10, 7289, 8219