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: ['W', '6991', 'K', '4039', '4951', '6337', '7465', 'X', 'v', 'G', 'W', '8363', '8743', 'N', 'V']

23, 6991, 11, 4039, 4951, 6337, 7465, 24, 22, 7, 23, 8363, 8743, 14, 22