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: ['C', '5809', '1063', 'f', 'p', '1263', '6371', 'S', 'o', '2007', 'p', 'r', 'B', 'y', 'l', '6403', '761', '2939', '9895', '6683', '5725', 'r', '8857', 'J', 'z', '7615', 'j', 'x', 'y', '3917', '9559', 'm', 'V', 'g']

3, 5809, 1063, 6, 16, 1263, 6371, 19, 15, 2007, 16, 18, 2, 25, 12, 6403, 761, 2939, 9895, 6683, 5725, 18, 8857, 10, 26, 7615, 10, 24, 25, 3917, 9559, 13, 22, 7