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: ['1819', 'g', 'X', '6751', '5381', 'q', 'K', '9047', '1647', '7867', '2467', '7971', '425', '5267', '111', '5865', 'z']

1819, 7, 24, 6751, 5381, 17, 11, 9047, 1647, 7867, 2467, 7971, 425, 5267, 111, 5865, 26