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: ['Q', '4509', 't', 'p', '4663', '2849', '5973', 'L', '4437', 'B', '4331']

17, 4509, 20, 16, 4663, 2849, 5973, 12, 4437, 2, 4331