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: ['7973', 'X', 'E', 'U', 'v', '599', 'y', 'z', '1389', 'M', 'G', 'y', '629', '2997', '145', 'V', 'O', '4681', 'Y', 'L', 'm', '1531', 'k', 'W', 'M', '5597', '2245', '7321', 'j', 'X', 'R', 'J', '1475', '3441', 'L', '2723', 'b']

7973, 24, 5, 21, 22, 599, 25, 26, 1389, 13, 7, 25, 629, 2997, 145, 22, 15, 4681, 25, 12, 13, 1531, 11, 23, 13, 5597, 2245, 7321, 10, 24, 18, 10, 1475, 3441, 12, 2723, 2