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: ['1607', '8847', '2419', 'S', 'C', 'r', 'w', 'I', 'n', '1989', 'z', '9143', '8257', 'T', 'X', 'C', '8429', '3927', 'J', '9503', '6907', 'l', 'l', '4093', 'P', '1113', '4697', 'P']

1607, 8847, 2419, 19, 3, 18, 23, 9, 14, 1989, 26, 9143, 8257, 20, 24, 3, 8429, 3927, 10, 9503, 6907, 12, 12, 4093, 16, 1113, 4697, 16