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: ['J', '799', '2069', '5443', '6151', '9905', 'X', '4687', 'o', 'h', 'F', '2471']

10, 799, 2069, 5443, 6151, 9905, 24, 4687, 15, 8, 6, 2471