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: ['z', '1023', '7509', '1353', 'h', 'D', '4975', '3837', 'o', 'x', '2101', '6659', '5987', 'u', '1411', 'B', '7851', '9169', '5307', '8367', '8207', '2311', 'i', '3553', '3365', 'm', 'c', 'M', '9561']

26, 1023, 7509, 1353, 8, 4, 4975, 3837, 15, 24, 2101, 6659, 5987, 21, 1411, 2, 7851, 9169, 5307, 8367, 8207, 2311, 9, 3553, 3365, 13, 3, 13, 9561