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: ['8673', 'l', '1569', 'c', '7289', '3337', '8681', 'e', 'r']

8673, 12, 1569, 3, 7289, 3337, 8681, 5, 18