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: ['O', 'w', '3057', 'n', 'a', 'i', '8543', '7933', 'A', '337', '4227', 'q', 'z', '2677', '5713', '8359', '8949', 'A', 's', 'E']

15, 23, 3057, 14, 1, 9, 8543, 7933, 1, 337, 4227, 17, 26, 2677, 5713, 8359, 8949, 1, 19, 5