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', '331', '1409', 'W', 'H', 'L', 'p', '8461', 'D', '5613', 'p', 'q', 'z', 'f', '5529', 'j', '2929', '425', '6941']

24, 331, 1409, 23, 8, 12, 16, 8461, 4, 5613, 16, 17, 26, 6, 5529, 10, 2929, 425, 6941