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: ['2959', '501', '8985', '8809', '8263', '2285', '8459', 'X', '5167', 'B', '9117', 'Z', '5693', '1117', 'Y', 'L', 'l', '6207']

2959, 501, 8985, 8809, 8263, 2285, 8459, 24, 5167, 2, 9117, 26, 5693, 1117, 25, 12, 12, 6207