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: ['G', '3937', '3801', '2553', '871', 'p', '323', 't', 'F', 'y', 'G', '8203', '6029', '4797', '1921', 'n', '4889', '4899', '8037']

7, 3937, 3801, 2553, 871, 16, 323, 20, 6, 25, 7, 8203, 6029, 4797, 1921, 14, 4889, 4899, 8037