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: ['5775', '5581', 'p', '9239', '3359', 'w', '5919', 't', 'A', 'M', 'U', '1781', 'w', '8413', '8167', '857', 'K', '6245', '2443', 'o', '6169', '7997', '3241', 'E', '9839', 'Y', 'm', '3569', '5695', '7', 'U', '9805', '6171', '8879']

5775, 5581, 16, 9239, 3359, 23, 5919, 20, 1, 13, 21, 1781, 23, 8413, 8167, 857, 11, 6245, 2443, 15, 6169, 7997, 3241, 5, 9839, 25, 13, 3569, 5695, 7, 21, 9805, 6171, 8879