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: ['i', '7781', 's', 'd', '9517', '1297', 'f', '6313', 'Y', '4853', '7605', '2613', 'q', '2933', '2603', '8573', '9869', '9173', 'i', 'q', '8379', '4481']

9, 7781, 19, 4, 9517, 1297, 6, 6313, 25, 4853, 7605, 2613, 17, 2933, 2603, 8573, 9869, 9173, 9, 17, 8379, 4481