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: ['V', '5305', '7921', '6789', '427', '9981', 'Z', 's', '159', 'b', '3075', '5305', '6463', 'D', '7171', '5907']

22, 5305, 7921, 6789, 427, 9981, 26, 19, 159, 2, 3075, 5305, 6463, 4, 7171, 5907