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: ['5317', '4205', '1063', 'N', '7549', '645', 'T', 'o', '6543', 'B', 'Z', '9023', '3937', '5143', 'k', '67', '4455', 'W', 'W']

5317, 4205, 1063, 14, 7549, 645, 20, 15, 6543, 2, 26, 9023, 3937, 5143, 11, 67, 4455, 23, 23