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', '6407', '4563', '6173', 'G', '2315', 't', 'f', 'w', 'w', '2439', '2485', 'S', 'L', '2045', '4621', 'x', '1435', 'w', '1195', '5179', '6123', 'l', '5393', 'k', '419', 'f', '9249', 'x', 'g', '1063', 'l', '9777', '8913', '4811', '3985', 'o', 'D', '143']

13, 6407, 4563, 6173, 7, 2315, 20, 6, 23, 23, 2439, 2485, 19, 12, 2045, 4621, 24, 1435, 23, 1195, 5179, 6123, 12, 5393, 11, 419, 6, 9249, 24, 7, 1063, 12, 9777, 8913, 4811, 3985, 15, 4, 143