Detailed Instructions: 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.
Q: ['D', 'r', '4797', 'h', '4057', '6439', '7773', '129', '9779', 'w', 'J', 'i', '7237', '991']
A:
4, 18, 4797, 8, 4057, 6439, 7773, 129, 9779, 23, 10, 9, 7237, 991