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: ['573', 'j', 'F', '9517', 'G', '1581', '59', 'K', '4635', '3127', 'd', '8559', 'z', 'P', '7577', '2379', '6455', '6907', 'u', 'u', 'a', '7771']

573, 10, 6, 9517, 7, 1581, 59, 11, 4635, 3127, 4, 8559, 26, 16, 7577, 2379, 6455, 6907, 21, 21, 1, 7771