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', '9661', '2273', 'i', 'G', 'N', 'W', '3473', 'h', '9913', '7303']

15, 9661, 2273, 9, 7, 14, 23, 3473, 8, 9913, 7303