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: ['8519', '8371', '5443', 'c', 'S', 'v', 'D', '7517', '207', 'N', '959', 'e', 'y', '7523', '8803', 'P', 'g', 'Q', 'c']

8519, 8371, 5443, 3, 19, 22, 4, 7517, 207, 14, 959, 5, 25, 7523, 8803, 16, 7, 17, 3