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: ['x', 'L', 'J', 'o', '4707', 'Q', 'O', '6649']

24, 12, 10, 15, 4707, 17, 15, 6649