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: ['6489', '1933', 'C', '2963', 'p', 'U', '7207', 'V', 'i', 'm', 'B', '9197']

6489, 1933, 3, 2963, 16, 21, 7207, 22, 9, 13, 2, 9197