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: ['M', 'l', '8279', '4907', '4637', 'O', '7699', '8169']

13, 12, 8279, 4907, 4637, 15, 7699, 8169