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: ['9899', 'E', '799', 'B', '623', 'g', 'i', 'P', '9193', '6159', 'L', 'v', '6483', 'F', '5547', 'o']

9899, 5, 799, 2, 623, 7, 9, 16, 9193, 6159, 12, 22, 6483, 6, 5547, 15