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', 'h', '6459', '5707', '3403', 'e', '3011', 'j', '283', '8821', '8655', '4285', 'r', '3155', 'J', '6883']

8, 8, 6459, 5707, 3403, 5, 3011, 10, 283, 8821, 8655, 4285, 18, 3155, 10, 6883