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: ['I', '91', 'n', '9297', '6439', '325', '6203', '5699', '3939', '3097', 'E']

9, 91, 14, 9297, 6439, 325, 6203, 5699, 3939, 3097, 5