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: ['1981', 'P', '7805', '7171', 'm', '8107', 'D', 'Q', '3855', '1393', 'Q', '1599', '3441', '8701', '5233', '5387', 'A', 'o', 'j', 'o']

1981, 16, 7805, 7171, 13, 8107, 4, 17, 3855, 1393, 17, 1599, 3441, 8701, 5233, 5387, 1, 15, 10, 15