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: ['S', '9727', '4697', '7507', 'V', 'b', '4411', 'l', '1231', 'O', 'P', 'k', '8259', '8105', 'q', '2035', 'O']

19, 9727, 4697, 7507, 22, 2, 4411, 12, 1231, 15, 16, 11, 8259, 8105, 17, 2035, 15