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: ['r', 'h', '9335', '3855', '1837', 'R', 'r', 'G', '9565', 'D', 'O', '6059', 'B']

18, 8, 9335, 3855, 1837, 18, 18, 7, 9565, 4, 15, 6059, 2