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: ['487', '1695', 'Q', '369', 'T', 'P', '6353', 'I', '8297', '4899', '473', '5651', 'Q', '7935', '9481', '9145', '8579', 'y', '113', '4551', 'K', '9029', 't', 'k', '1819', 'b', 'b', '6475', 'D', 'D']

487, 1695, 17, 369, 20, 16, 6353, 9, 8297, 4899, 473, 5651, 17, 7935, 9481, 9145, 8579, 25, 113, 4551, 11, 9029, 20, 11, 1819, 2, 2, 6475, 4, 4