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: ['q', '4105', '5029', '309', 'd', 'U', 'J', '5727', '6309', 'S', '5479', 'S', 'z', '2915', 'B', '4117', '3321']

17, 4105, 5029, 309, 4, 21, 10, 5727, 6309, 19, 5479, 19, 26, 2915, 2, 4117, 3321