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: ['8609', 'k', 'D', 'd', '4741', 'v', '8237', '2179', 'c', '9589', 'g', 'A', '4291', '5357', 'o', 'B', 'P', 'R', 'O', '7519', '1147', '5203', 'I', 'Q', '3389', '813', '3147', 't', 'i', '1619', '4715', '4117', '7357', '947', '1333']

8609, 11, 4, 4, 4741, 22, 8237, 2179, 3, 9589, 7, 1, 4291, 5357, 15, 2, 16, 18, 15, 7519, 1147, 5203, 9, 17, 3389, 813, 3147, 20, 9, 1619, 4715, 4117, 7357, 947, 1333