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: ['6735', '1263', '8779', 'C', 'C', 'w', '2067', '5213', 'h', 'k', '9499', '9407', '1035', 'l', 'C', 'x', 'd']

6735, 1263, 8779, 3, 3, 23, 2067, 5213, 8, 11, 9499, 9407, 1035, 12, 3, 24, 4