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: ['i', 'c', '8297', '621', 'B', '4293', '3937', 'u', '2173', '5259']

9, 3, 8297, 621, 2, 4293, 3937, 21, 2173, 5259