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: ['9013', 'R', '1807', 'a', '1289', '5183', 'z']

9013, 18, 1807, 1, 1289, 5183, 26