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: ['4461', 'W', 'N', 't', '2813', 'z', 'a', 'U', 'z', 'T', 'W', 's', '8309']

4461, 23, 14, 20, 2813, 26, 1, 21, 26, 20, 23, 19, 8309