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: ['7473', 'z', '8681', 'k', 'B', 'p', 's', '2295', '5489', 'l']

7473, 26, 8681, 11, 2, 16, 19, 2295, 5489, 12