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: ['787', '7573', '5013', '5861', 'r', 'J', '3503', '9955', '8119', '83', 'R', 'i', 'O', 'O', 'H', 'm', '2383', '387', 'X', 'h', 'B', 'e']

787, 7573, 5013, 5861, 18, 10, 3503, 9955, 8119, 83, 18, 9, 15, 15, 8, 13, 2383, 387, 24, 8, 2, 5