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', '8685', 'o', 'K', '6187', 'z', 'Q', 'o', '5411', 'L', '8445', '2135']

24, 8685, 15, 11, 6187, 26, 17, 15, 5411, 12, 8445, 2135