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: ['4341', '9611', 'n', '8375', 'X', '2507']

4341, 9611, 14, 8375, 24, 2507