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: ['9359', 'e', '553', '9741', '3239', '631', '5403', '4073', '4223', 's', 'k', 'v', 'w', 'u']

9359, 5, 553, 9741, 3239, 631, 5403, 4073, 4223, 19, 11, 22, 23, 21