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: ['9905', '8047', '4391', '9339', '2337', '4505', '4579', 'd', '6493']

9905, 8047, 4391, 9339, 2337, 4505, 4579, 4, 6493