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: ['f', '1009', 'y', 'v', '951', 'n', 't', '6275', '1681', 'Q', 'w', '4615', '4199', 'b', 'z', '5381', '2687', '945', 'n', 'O']

6, 1009, 25, 22, 951, 14, 20, 6275, 1681, 17, 23, 4615, 4199, 2, 26, 5381, 2687, 945, 14, 15