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: ['4593', 'q', '9953', 'D', '4757', '1923', '9899', '7135', 'n', 'f', '5097', '5249', '2761', 'X', 'W', 'z', '447', 'W']

4593, 17, 9953, 4, 4757, 1923, 9899, 7135, 14, 6, 5097, 5249, 2761, 24, 23, 26, 447, 23