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: ['8473', 'R', 'm', 'D', 'A', '723', 'Q', 'r']

8473, 18, 13, 4, 1, 723, 17, 18