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: ['C', 's', 'L', '1439', '1579', '2325', 'o', 'Z']

3, 19, 12, 1439, 1579, 2325, 15, 26