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: ['Y', '177', 'O', '1035', 'q', '797', '6911', '393', '7471', 'a', 'n', 'E', '3731', '6247', '687', '4177', 'A', 'O', 'T', '247', 'L']

25, 177, 15, 1035, 17, 797, 6911, 393, 7471, 1, 14, 5, 3731, 6247, 687, 4177, 1, 15, 20, 247, 12