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: ['3271', 'M', 'k', 'I', 'i', '1871', '6091', '5359', '31', '9935', 'Q', 'D', '7721', '3177', 'N', '7203', '4035', '9231', '4455', 'a', '153', 'u', 'e', '7451', '3769', '7071', '149', '1227', 'U', '8515', 'g']

3271, 13, 11, 9, 9, 1871, 6091, 5359, 31, 9935, 17, 4, 7721, 3177, 14, 7203, 4035, 9231, 4455, 1, 153, 21, 5, 7451, 3769, 7071, 149, 1227, 21, 8515, 7