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: ['m', 'L', 'Z', 'I', '4371', '9125', '6835', '3335', '6275', 'B', 'U', '4785', '145', 'B', 'f', 'x', 'T', 'B', 'D', 'N', 'Y', '5547', 'J', 'a', 'j', '983', 'j', 'E', '3473', 'U', 'A', '7233', 'M', '1029', 'K', '7685', 'j']

13, 12, 26, 9, 4371, 9125, 6835, 3335, 6275, 2, 21, 4785, 145, 2, 6, 24, 20, 2, 4, 14, 25, 5547, 10, 1, 10, 983, 10, 5, 3473, 21, 1, 7233, 13, 1029, 11, 7685, 10