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: ['3147', '9545', '923', '2397', 'O', '2371', '5007', 'M', '6263', 'v', 'l', '4237', '2125', 'y', 'W', 'G', '9485', 'k', '6223', '5311', '3831', 'm', '9827', 'B', 'V', 'k', '3259']

3147, 9545, 923, 2397, 15, 2371, 5007, 13, 6263, 22, 12, 4237, 2125, 25, 23, 7, 9485, 11, 6223, 5311, 3831, 13, 9827, 2, 22, 11, 3259