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: ['6561', '5127', '1473', '3975', '5099', 'z', '559', 'k', 'o', '2187']

6561, 5127, 1473, 3975, 5099, 26, 559, 11, 15, 2187