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', '29', '4845', 'y', 'j', '6269', 'L', '5723', 'J', '9363', '2835', 'F', '9783', '2871', 't', 'v', 'r', '9453', 'o', 'P', '2139', 'B', 'V', '4907', '3671', '2689', 'M']

24, 29, 4845, 25, 10, 6269, 12, 5723, 10, 9363, 2835, 6, 9783, 2871, 20, 22, 18, 9453, 15, 16, 2139, 2, 22, 4907, 3671, 2689, 13