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: ['6851', '3633', 'q', 'X', 'x', '4555', 'y', '7341', '633', '1849', '2853', '2477', 'U', 'I', '9535', '7649', 'C', '883', 'G', 'h', '5675', '3155', 'i', '6981', 'R', '6059', '6279', 'y', 'k', '495', '2599']

6851, 3633, 17, 24, 24, 4555, 25, 7341, 633, 1849, 2853, 2477, 21, 9, 9535, 7649, 3, 883, 7, 8, 5675, 3155, 9, 6981, 18, 6059, 6279, 25, 11, 495, 2599