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: ['5011', '4553', '6279', '3989', '9377', 'n', '1993', 'z']

5011, 4553, 6279, 3989, 9377, 14, 1993, 26