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: ['L', '3775', '1751', 'a', 'r', '7021', '4727', 'g', 'C', '1617', '4795', '9635', 'J', 'G', 'M', 's', 'M', 'E', 't', 'b', '7249', '467', 'A', '1133', '6591', '8793', '993', 'w', 'P', '8533', 'H', 'o']

12, 3775, 1751, 1, 18, 7021, 4727, 7, 3, 1617, 4795, 9635, 10, 7, 13, 19, 13, 5, 20, 2, 7249, 467, 1, 1133, 6591, 8793, 993, 23, 16, 8533, 8, 15