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: ['c', 'L', 'i', 'm', '6927', 'S', 'L', '5277', 'I', 'S', '5387', 'P', '3245', '6531', 'C', 'k', '2655', '4073']

3, 12, 9, 13, 6927, 19, 12, 5277, 9, 19, 5387, 16, 3245, 6531, 3, 11, 2655, 4073