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', '6483', 'c', 'E', '3391', '8715', '4873', 'Q']

17, 6483, 3, 5, 3391, 8715, 4873, 17