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: ['3809', '7891', 'O', 'c', 'h', 'V', '3621', 'b', '4853', '2899', 'n', 'P', '89', 'F', 'T', '5571', '2573', 'w', 'w', 'u', 't', 'i', '2715', 'C', '3441']

3809, 7891, 15, 3, 8, 22, 3621, 2, 4853, 2899, 14, 16, 89, 6, 20, 5571, 2573, 23, 23, 21, 20, 9, 2715, 3, 3441