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: ['y', 'P', '1301', 'W', 'E', 'Z', '1103', '5425', '3317', 'O', '341', '5517', 'D', '3375']

25, 16, 1301, 23, 5, 26, 1103, 5425, 3317, 15, 341, 5517, 4, 3375