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: ['8407', 'L', 'p', '5585', 'b', '9035', 's', '1007', '9889', '9993', 'H']

8407, 12, 16, 5585, 2, 9035, 19, 1007, 9889, 9993, 8