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: ['451', 'y', '7809', '4463', 'I', '4981', 'I', '2033', '4149', 'G', '3013', 'h', '3355', 'N', '9699', 'B', 'v', '9463', 'v']

451, 25, 7809, 4463, 9, 4981, 9, 2033, 4149, 7, 3013, 8, 3355, 14, 9699, 2, 22, 9463, 22