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', '1099', '8439', 'G', 'r', '3549', 'W', '359', '4171', 'B', '4737']

17, 1099, 8439, 7, 18, 3549, 23, 359, 4171, 2, 4737