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', '5293', 'e', '9589', '5499', 'C', 'v', '4705', '1297', '7053', 'o', '6309', 's', 'r', 's', '8807', 'H']

11, 5293, 5, 9589, 5499, 3, 22, 4705, 1297, 7053, 15, 6309, 19, 18, 19, 8807, 8