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', '4661', 'n', 'p', '3447', 'E', 'h', '7105', '9101', 'O', '9111', 'T', '1131', '409', 'H', 'W', '9509', '2561', 'c', 'C', '741', '7583', 'C', 'k', 'e', 'd', 'J', 'S', '7501']

12, 4661, 14, 16, 3447, 5, 8, 7105, 9101, 15, 9111, 20, 1131, 409, 8, 23, 9509, 2561, 3, 3, 741, 7583, 3, 11, 5, 4, 10, 19, 7501