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: ['y', 'C', '8443', '6961', 'A', 'C', 'N', '3491', '7735', '3963', '9771', 'z', '1237', '673', '3379', 'Y', '3847', '9663', 'S', 'B', '1097', 'h', '4603']

25, 3, 8443, 6961, 1, 3, 14, 3491, 7735, 3963, 9771, 26, 1237, 673, 3379, 25, 3847, 9663, 19, 2, 1097, 8, 4603