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: ['6801', 'U', 'K', '3873', '3137', 'b', 'm', '5427', '1743', '587', '5391', '4179', '3181', '5957', 'N', 'k', 'v']

6801, 21, 11, 3873, 3137, 2, 13, 5427, 1743, 587, 5391, 4179, 3181, 5957, 14, 11, 22