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: ['9173', 'f', '2463', '5617', '5031', '8709', 's', 'e', '9615', 'z', '3807', 'x', '9573', '8929', '9641', '8829', '1789', 'a', 'd', 'i']

9173, 6, 2463, 5617, 5031, 8709, 19, 5, 9615, 26, 3807, 24, 9573, 8929, 9641, 8829, 1789, 1, 4, 9