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: ['8851', '1809', 'W', 'L', 'C', 'M', 'q', 'B', '1335', '6777', 'Z']

8851, 1809, 23, 12, 3, 13, 17, 2, 1335, 6777, 26