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: ['2173', 's', 'h', '6041', 'M', '6277', '6273', 'U', '2257', '6039', '7661', '1503', '7207', '39', 'T', 'y', '2785', 'v', 't', 'K', 'x']

2173, 19, 8, 6041, 13, 6277, 6273, 21, 2257, 6039, 7661, 1503, 7207, 39, 20, 25, 2785, 22, 20, 11, 24