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: ['7699', 'a', '1731', '6365', '7531', '9647', 'z', 'O', 'm', '5781', '1271', 'q', 'O', 'I', 'I']

7699, 1, 1731, 6365, 7531, 9647, 26, 15, 13, 5781, 1271, 17, 15, 9, 9