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: ['Q', 'b', 'E', 'k', 'z', 'q', 'O', 'u', 'Q', 'B', '6683', '2413', 'h', 'J', '5877', '3079', '3197', '7911', 'V', 'E', '6149', 'X', '6987', '1355', 'I', '5259', 'k', '4363', '6103', '6627', 'i', 'Z', '5213', '5709', 'W', 'Y']

17, 2, 5, 11, 26, 17, 15, 21, 17, 2, 6683, 2413, 8, 10, 5877, 3079, 3197, 7911, 22, 5, 6149, 24, 6987, 1355, 9, 5259, 11, 4363, 6103, 6627, 9, 26, 5213, 5709, 23, 25