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: ['M', 't', 'K', 'a', '5411', 'H', '9517', '1165', '3509', '7399', '1421', 'x', '2001', 'q', '6873', 'D', 'c', 'h', '913', 'F', 'w', '5271', 'u', 'C', 't', '9381', 'K']

13, 20, 11, 1, 5411, 8, 9517, 1165, 3509, 7399, 1421, 24, 2001, 17, 6873, 4, 3, 8, 913, 6, 23, 5271, 21, 3, 20, 9381, 11