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: ['P', '407', 'y', '8201', '4107', 'G', '5251', 'r', 'H', '427', 'm', '2257', '2719', '9113', 'l', '4879', 'o', '6173', '9217', 'l', '897', '8379', 'D', 'X', 'B', '4577', 'Z']

16, 407, 25, 8201, 4107, 7, 5251, 18, 8, 427, 13, 2257, 2719, 9113, 12, 4879, 15, 6173, 9217, 12, 897, 8379, 4, 24, 2, 4577, 26