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: ['6361', '785', 'C', '7997', '4101', 'P', 'i', '1693', '4997', '1875', '7211', '721', 'Z', 'x', '8291', '4155', '8283', 'W', '9997', '2807', '3269', '6251', '7585', 'a']

6361, 785, 3, 7997, 4101, 16, 9, 1693, 4997, 1875, 7211, 721, 26, 24, 8291, 4155, 8283, 23, 9997, 2807, 3269, 6251, 7585, 1