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: ['743', '7311', 'D', 'c', '8069', '809', '7793', 'd', 'D', 'U', 'n', 'n', 'l', 's', 'G', 'U', '4419', 'e', 'm', 'y', '9921', 'j', '829', '985', '8061', '9391', 's', '3711', 'a', 'H']

743, 7311, 4, 3, 8069, 809, 7793, 4, 4, 21, 14, 14, 12, 19, 7, 21, 4419, 5, 13, 25, 9921, 10, 829, 985, 8061, 9391, 19, 3711, 1, 8