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: ['h', '1447', '1291', 'd', 'o', '1587', 'b', '5053', '4123', '3427', '5839', 'Y', 'x', '1837', 'T', '8005', 'C', '9847', '5513', '7687', '57', 'L', '7315', 'r', '8361', '8871', 'i', '7023', 'C', '2987', 'X', 'y', 'D']

8, 1447, 1291, 4, 15, 1587, 2, 5053, 4123, 3427, 5839, 25, 24, 1837, 20, 8005, 3, 9847, 5513, 7687, 57, 12, 7315, 18, 8361, 8871, 9, 7023, 3, 2987, 24, 25, 4