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', 'N', '7905', '6039', 'H', '4661']

25, 14, 7905, 6039, 8, 4661