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: ['6321', 'c', 't', '6153', 'A', '6563', '203', 'Q', 'C', '5935', '155', '8449', '2503', '1425', '3839', '7365', '3233', '8297', 'I', '6523', '6609', 'Z']

6321, 3, 20, 6153, 1, 6563, 203, 17, 3, 5935, 155, 8449, 2503, 1425, 3839, 7365, 3233, 8297, 9, 6523, 6609, 26