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: ['E', '5647', 'O', '3573', '2325', '8757', 'L', 'N', '3617', '9525', '5707', '1661', '2299', 'M']

5, 5647, 15, 3573, 2325, 8757, 12, 14, 3617, 9525, 5707, 1661, 2299, 13