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: ['2953', 'J', '4519', '5117', '9035', '1991', 'Q', 'P', 'z', '7731', '2945', '2167', '1915', '2049', '9859', 's', 'C', '4877', '9353']

2953, 10, 4519, 5117, 9035, 1991, 17, 16, 26, 7731, 2945, 2167, 1915, 2049, 9859, 19, 3, 4877, 9353