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: ['a', 'C', '5641', '4773', 'k', 'S', '3199', 'g', '6895', 'F', '6959', '2883', 'Q', '3419', 'A', '2997', '2907', 'm', 'C', 'I', '5235', '1359', 'G', '3375']

1, 3, 5641, 4773, 11, 19, 3199, 7, 6895, 6, 6959, 2883, 17, 3419, 1, 2997, 2907, 13, 3, 9, 5235, 1359, 7, 3375