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: ['4027', 'J', '1859', 'c', 'Y', 'W', '1321', 'M', '1899', 'i', 'H', '9987', 'M', '357', 'W', '8877', 'n', 'X', '863', '6227', '6459', '3017', 'F', '4103']

4027, 10, 1859, 3, 25, 23, 1321, 13, 1899, 9, 8, 9987, 13, 357, 23, 8877, 14, 24, 863, 6227, 6459, 3017, 6, 4103