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: ['1537', '6935', 'G', '8323', 'A', '1861', '1605', 'W', 'g', 'r', '6917', '2051', '3307', '3871', '181', '8785', 'S', '5833', '2191', '1917', '4239', '1493', '5999', 'o', '1213', '3497', 'w', '3723', '2715', 'D', 'y', '2407', 'h', 'N', '5239', 'C', '3177']

1537, 6935, 7, 8323, 1, 1861, 1605, 23, 7, 18, 6917, 2051, 3307, 3871, 181, 8785, 19, 5833, 2191, 1917, 4239, 1493, 5999, 15, 1213, 3497, 23, 3723, 2715, 4, 25, 2407, 8, 14, 5239, 3, 3177