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: ['7471', '5229', 'J', '395', 't', 'M', 'b', 'V', '9067', '1745', '807', '1243', '5153', 'C', '1779', 'I', '3049', 'E', '7545', '3019', 'F', '8915', '277', '3789', 'k', 'E', 'L', 'L', 'x', 'J', '4429', 'P', '1839']

7471, 5229, 10, 395, 20, 13, 2, 22, 9067, 1745, 807, 1243, 5153, 3, 1779, 9, 3049, 5, 7545, 3019, 6, 8915, 277, 3789, 11, 5, 12, 12, 24, 10, 4429, 16, 1839