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', '5559', '9893', '7397', '4471', 'd', '4353', '7631', 'x', 'k', '629', '8863', '4187', 'H', '2373', 'z']

9, 5559, 9893, 7397, 4471, 4, 4353, 7631, 24, 11, 629, 8863, 4187, 8, 2373, 26