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: ['g', '4285', 'y', '8421', 'L', '5559', '53', 'z', 'o', '3273', 's', 'z', 'e', '1173', '6069', 'a', 'M', 'C', 'D', 'j', 'B', 'r', '4461', '6339']

7, 4285, 25, 8421, 12, 5559, 53, 26, 15, 3273, 19, 26, 5, 1173, 6069, 1, 13, 3, 4, 10, 2, 18, 4461, 6339