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: ['7881', '6593', '1747', '9593', '1131', 'd', '3971', '877', '3203', '9719', '4695', 'M', 'J', 'L']

7881, 6593, 1747, 9593, 1131, 4, 3971, 877, 3203, 9719, 4695, 13, 10, 12