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: ['L', '1213', 'h', 'O', '3347', 'C', '9391', '293', '8177', 'r', '5515', '5025', '2559', '1463', 'c', 'G', 'B', 'E', '7115', '633', 'f', 'P', 'k', '5371', '3507', 'k', '243', '7501', 'U', '3309', '7749', 'j', '9977', 'K']

12, 1213, 8, 15, 3347, 3, 9391, 293, 8177, 18, 5515, 5025, 2559, 1463, 3, 7, 2, 5, 7115, 633, 6, 16, 11, 5371, 3507, 11, 243, 7501, 21, 3309, 7749, 10, 9977, 11