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: ['4493', '1971', 'c', 'N', '401', '8933', 'T', '6371', 'H', 'u', '7665', 'C', '1933', 'U', 'b', 'i', '4875', 'H', '7283', '6093', '9519', 'F', 'B', '1673', '6473', 'W', '67', '4529', '1141', 'H', '1927', '5557', '6035']

4493, 1971, 3, 14, 401, 8933, 20, 6371, 8, 21, 7665, 3, 1933, 21, 2, 9, 4875, 8, 7283, 6093, 9519, 6, 2, 1673, 6473, 23, 67, 4529, 1141, 8, 1927, 5557, 6035