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: ['j', '8929', 'A', 'I', 'x', '2813', 'J', '7609', '5961']

10, 8929, 1, 9, 24, 2813, 10, 7609, 5961