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: ['8391', 'G', '2271', '3931', 'w', 'n', 'm', '6197', 'B']

8391, 7, 2271, 3931, 23, 14, 13, 6197, 2