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: ['E', '6199', 'h', 'F', 'B', 'Y', 's', 'i', 's', '8565', '2625', '725', 't', '9861', '559', '2807', '9555', '2835', 'j', 'T', '7893', 'a', '375', 'U', 'v', 'x', '2459', 'C', '5399', '7687', 'I']

5, 6199, 8, 6, 2, 25, 19, 9, 19, 8565, 2625, 725, 20, 9861, 559, 2807, 9555, 2835, 10, 20, 7893, 1, 375, 21, 22, 24, 2459, 3, 5399, 7687, 9