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: ['8071', '4253', '6907', '9841', '775', '9615', '1479', '5631', 'o', 'c', '4155', '3219', 'R', '7481', '3167', 'G', 't', 'A', '457', 'M', 'M', 'B']

8071, 4253, 6907, 9841, 775, 9615, 1479, 5631, 15, 3, 4155, 3219, 18, 7481, 3167, 7, 20, 1, 457, 13, 13, 2