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: ['s', '1165', 'z', '2673', 's', 'n', '847', '2553', '9111', 'w', '9411', 'B', 'U', 'P', 'c']

19, 1165, 26, 2673, 19, 14, 847, 2553, 9111, 23, 9411, 2, 21, 16, 3