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: ['7333', '4413', 'H', '3605', 'L', '8737', '6505', '3921', 'A', 'y', 'S']

7333, 4413, 8, 3605, 12, 8737, 6505, 3921, 1, 25, 19