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: ['D', 'b', '8477', 'z', 'U', '925', 'O', '2345', '4413', 's', 'M', 'p']

4, 2, 8477, 26, 21, 925, 15, 2345, 4413, 19, 13, 16