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: ['o', 'Y', '7071', 'Y', 'e', 'D', 'i', 'Y', '5447', '9263', 'G']

15, 25, 7071, 25, 5, 4, 9, 25, 5447, 9263, 7