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: ['X', 'I', 'x', '6887', '4413', 'i', '973', '7905', '7851', 'M', 'b', 'N', 's', 'w', '9777', 'C', '8841', '7661', '4921', '8261', '5539', '6315']

24, 9, 24, 6887, 4413, 9, 973, 7905, 7851, 13, 2, 14, 19, 23, 9777, 3, 8841, 7661, 4921, 8261, 5539, 6315