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: ['H', '7659', '3877', '1021', 'n', '3915', 'V', 'd', 'o', '9235', 'X', '6373', 'k', 'R', '6219', 'J', 'w', 'F', 'c', 'P', '8485']

8, 7659, 3877, 1021, 14, 3915, 22, 4, 15, 9235, 24, 6373, 11, 18, 6219, 10, 23, 6, 3, 16, 8485