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: ['8959', 'Q', 'A', '8757', 'Y', 'i', '1559', 'z', '5943']

8959, 17, 1, 8757, 25, 9, 1559, 26, 5943