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: ['I', '9689', 'I', '6691', '6877', '3677', 'A', 'p', '7839', '2015', 'i', '1155', '3413', '7027', '8411', '9343', '1751', 'Z', 'M', '7711', 'z', '7577', '8159', '375', 'a']

9, 9689, 9, 6691, 6877, 3677, 1, 16, 7839, 2015, 9, 1155, 3413, 7027, 8411, 9343, 1751, 26, 13, 7711, 26, 7577, 8159, 375, 1