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', '621', '1425', 'e', '2445', 'J', 'C', '2711', '9725', '8107']

15, 621, 1425, 5, 2445, 10, 3, 2711, 9725, 8107