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: ['U', '1589', 'A', 'I', 'e', 's', '5569', 'U', 'j', '5921', 'L', 'A', 'c', '4195', 'P', 'D', '2309', 'Q', '5461', 'G', 'z', '1989', '701', 'f', '1947', 'N', '5933', '7', '8329', 'v', '4003', '4563', '2355', '2561', 'H']

21, 1589, 1, 9, 5, 19, 5569, 21, 10, 5921, 12, 1, 3, 4195, 16, 4, 2309, 17, 5461, 7, 26, 1989, 701, 6, 1947, 14, 5933, 7, 8329, 22, 4003, 4563, 2355, 2561, 8