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: ['8353', '8039', '2293', 's', '8137', 'u', '7187', 'T', '8497']

8353, 8039, 2293, 19, 8137, 21, 7187, 20, 8497