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: ['C', '4399', '6345', 'q', 'n', '1717', '8375', 'f', 'y', 'L', '3095', '1073', '5715', 'E', 'z', '8515', 'i', 'u', 'D', 'a', '9405', '9853', '7493', 'T', '9277', 's', 'Z']

3, 4399, 6345, 17, 14, 1717, 8375, 6, 25, 12, 3095, 1073, 5715, 5, 26, 8515, 9, 21, 4, 1, 9405, 9853, 7493, 20, 9277, 19, 26