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: ['Y', 'R', 'H', '8947', 'C', '1837', 'R', 'T', '5277', '2565', '2329']

25, 18, 8, 8947, 3, 1837, 18, 20, 5277, 2565, 2329