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: ['7291', '7913', 'V', '5861', 'a', 'i', 'H', '7491', 'e', '1121', '9095', '487', '8323', '5443', 'b', 'V', '1451', 'k', 'D', 'D', 'L', '1187', '6789', '4757', '2021', '1755', 'X', 'D']

7291, 7913, 22, 5861, 1, 9, 8, 7491, 5, 1121, 9095, 487, 8323, 5443, 2, 22, 1451, 11, 4, 4, 12, 1187, 6789, 4757, 2021, 1755, 24, 4