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: ['o', '7289', '1243', '4737', 'n', '7591', '1221', 'O', 'i', '4677', '8025', 'U', '2889', '425', 'C', 'P', 'q', '5805', 'Q', '6019', 'y', '21', '6265', '5943', 'S', 't', '2963', '3879', 'y', '1029', 'Z', 'c', 'X', 'v', 'c']

15, 7289, 1243, 4737, 14, 7591, 1221, 15, 9, 4677, 8025, 21, 2889, 425, 3, 16, 17, 5805, 17, 6019, 25, 21, 6265, 5943, 19, 20, 2963, 3879, 25, 1029, 26, 3, 24, 22, 3