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: ['l', '8341', '2295', '6021', '151', '5833', '7319', 'h', '9881', 'O', '9487']

12, 8341, 2295, 6021, 151, 5833, 7319, 8, 9881, 15, 9487