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', 'R', 'G', '7573', '8549', 'u', 'd', 'C', 'V', 'g', 'u', '2939', 'O', '4391', 'n', '3801', '9901', '2687', 'd', 'o', 'r', '4799', '7383', 'N']

8, 18, 7, 7573, 8549, 21, 4, 3, 22, 7, 21, 2939, 15, 4391, 14, 3801, 9901, 2687, 4, 15, 18, 4799, 7383, 14