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', 'n', '277', 'E', 'W', '4657', '4353', '9511', 'z', 's', '9573', '5811', '4301', '3753', '9371', '8231', 'M', 'c', 'X', '2379', '5795']

3, 14, 277, 5, 23, 4657, 4353, 9511, 26, 19, 9573, 5811, 4301, 3753, 9371, 8231, 13, 3, 24, 2379, 5795