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', '6419', 'P', 'q', '7871', '3579', '4847', '1185', 'K', '1525', 'g', 'Z', 'T', 't', '1109', '507', '659', '5553', 'D', '1539', '8037', 'v', '6761', '7541', 'e', 's', '2295', 'u', 'k', '4563', '6103', 'y', 't', 'D', 'x', '7601', 'N', '4303', '9847', '9603']

3, 6419, 16, 17, 7871, 3579, 4847, 1185, 11, 1525, 7, 26, 20, 20, 1109, 507, 659, 5553, 4, 1539, 8037, 22, 6761, 7541, 5, 19, 2295, 21, 11, 4563, 6103, 25, 20, 4, 24, 7601, 14, 4303, 9847, 9603