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: ['K', 'a', 'B', '2959', 'R', '4461', 'g', '5731', 'l', '9197']

11, 1, 2, 2959, 18, 4461, 7, 5731, 12, 9197