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: ['3803', 'K', 'O', '4151', 'F', 'z', '3171', '8033', 'L', '9431', 't', '6881']

3803, 11, 15, 4151, 6, 26, 3171, 8033, 12, 9431, 20, 6881