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', '1705', '7557', 'Q', 'Q', '6997', 'e', 'b', 'H', '431', 'Q', '3009', '6945', '8317', 'a', '7665', '4273', '1875', '5143', '1485', 'i', 'z', 'i', '4049', 'L']

15, 1705, 7557, 17, 17, 6997, 5, 2, 8, 431, 17, 3009, 6945, 8317, 1, 7665, 4273, 1875, 5143, 1485, 9, 26, 9, 4049, 12