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: ['D', '3991', '4251', '2841', '9687', 'Q', 'O', '1913', 'h', 'Z', 'M', '8077', '977', '2695', '6145', 'q']

4, 3991, 4251, 2841, 9687, 17, 15, 1913, 8, 26, 13, 8077, 977, 2695, 6145, 17