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: ['c', '1449', 'G', '8729', 'i', '8151', 'Y', '995', 'i', 'm', 'W', '4053', '8325', 'L', 'l', 'f', '6219', 'L', 'i']

3, 1449, 7, 8729, 9, 8151, 25, 995, 9, 13, 23, 4053, 8325, 12, 12, 6, 6219, 12, 9