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: ['d', 's', '8973', 'b', 'G', 'k', '8241', '3731', 'f', '247', 'g', 'a', 'H']

4, 19, 8973, 2, 7, 11, 8241, 3731, 6, 247, 7, 1, 8