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: ['1581', '1449', 'c', '7547', 'g', '8211', '3307', '7357', '4249']

1581, 1449, 3, 7547, 7, 8211, 3307, 7357, 4249