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: ['U', 'G', 'K', '4671', 'j', '3161', '8669', 'R', '7691', 'P', '4273', 'L', 'G', '2315', 'E', '155', '1957', 'm', 'f', 'p', 'A', '2229', 'F', 'T', 'm', 'a', 'G']

21, 7, 11, 4671, 10, 3161, 8669, 18, 7691, 16, 4273, 12, 7, 2315, 5, 155, 1957, 13, 6, 16, 1, 2229, 6, 20, 13, 1, 7