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: ['s', 'N', '6327', 'I', '463', 'F', 'S', 'N', '5121', 'O', 'P', '1753', 'v', '4957', '873', 'G', 'k', 'B', '5915', '281', 'O', '4689', 'x', '8481', 'Q', 'k', '4753', '4143', '1949', 'L', '8493', 'U', 'l', 'z', '805', 'D', 'v', 'u']

19, 14, 6327, 9, 463, 6, 19, 14, 5121, 15, 16, 1753, 22, 4957, 873, 7, 11, 2, 5915, 281, 15, 4689, 24, 8481, 17, 11, 4753, 4143, 1949, 12, 8493, 21, 12, 26, 805, 4, 22, 21