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: ['D', '7291', 'E', 'g', '7973', 'J', '187', '4581', 'a', '7355', '8961', '3643', 'k', 'F', 'w', 'H', 'f', '2637', 'y', 'm', 'z', 'e', 'M', 'w', 'n', '8143', '8781', '2385', '8371', 'R', '7983', 'A', '6433', 'L', 'j', '8125', '7075', '1415', '6949', '9273']

4, 7291, 5, 7, 7973, 10, 187, 4581, 1, 7355, 8961, 3643, 11, 6, 23, 8, 6, 2637, 25, 13, 26, 5, 13, 23, 14, 8143, 8781, 2385, 8371, 18, 7983, 1, 6433, 12, 10, 8125, 7075, 1415, 6949, 9273