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', 'X', 'z', 'u', '7881', 'R', 'E', '8227', '2437', '3747', 'L', '2637', 'a', '4375', '3685', 'N', 'M', '9607', 'w', '5867', '2799', 's', 'O', 'Z', '9483', '8809', '4593', '9687', 'p', 'Q', 'f']

12, 24, 26, 21, 7881, 18, 5, 8227, 2437, 3747, 12, 2637, 1, 4375, 3685, 14, 13, 9607, 23, 5867, 2799, 19, 15, 26, 9483, 8809, 4593, 9687, 16, 17, 6