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: ['6723', 'R', 'L', '9161', 'D', '8677', '9803', '2447']

6723, 18, 12, 9161, 4, 8677, 9803, 2447