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: ['t', '4155', '5445', 'Y', 'j', 'c', '2477', 'z', 'W', 'k', 'k', '5561', 'T', '8249', 'm']

20, 4155, 5445, 25, 10, 3, 2477, 26, 23, 11, 11, 5561, 20, 8249, 13