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: ['6815', '1035', '6363', 'J', '9465', 'K', 'k', 'Y', 'I', 't', 'B']

6815, 1035, 6363, 10, 9465, 11, 11, 25, 9, 20, 2