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: ['8909', '8239', '9543', '7199', '5871', '1729', '9195', '7487', '6819', '8179', '7949', 'U', '4771', 'h', '2161', '3221', 'Z', '1137', '5689', '9141', '2497', '1567', 'A', '3561', '7767', '4159']

8909, 8239, 9543, 7199, 5871, 1729, 9195, 7487, 6819, 8179, 7949, 21, 4771, 8, 2161, 3221, 26, 1137, 5689, 9141, 2497, 1567, 1, 3561, 7767, 4159