Detailed Instructions: 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.
Q: ['R', '2503', '2729', 'l', 'B', 'D', '8609', '8035', '7263', 'O', '499', '7535', '553', '4859', 'j', '1767', '4153', '9031']
A:
18, 2503, 2729, 12, 2, 4, 8609, 8035, 7263, 15, 499, 7535, 553, 4859, 10, 1767, 4153, 9031