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: ['t', 'K', '809', 'X', 'o', '4573', 'j', 'q', 'G', 'r', 'I', '5215', 'e', '8133', '5051', 'K', '1009', '7455', '789', 'B', '6605', 'G', 'B', 'a', '2707', '3219', 'Y', 'L', 'K', 'x', 'B', '9215', '9813', '1289', 'D']

20, 11, 809, 24, 15, 4573, 10, 17, 7, 18, 9, 5215, 5, 8133, 5051, 11, 1009, 7455, 789, 2, 6605, 7, 2, 1, 2707, 3219, 25, 12, 11, 24, 2, 9215, 9813, 1289, 4