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: ['9731', 'K', '4275', '6133', 'L', '4463', '8825', '8305', '4371', '4871']

9731, 11, 4275, 6133, 12, 4463, 8825, 8305, 4371, 4871