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', '8383', 'F', '2135', 'd', '929', 'H', 'T', '7437', '2511', 'a', '8243', '23', '791', 'r', 'c', 'S', '5847', '6877', '3573', 'c', '3057', '3781', '7297', '2433', 'J', 'P', '8579', '1759']

18, 8383, 6, 2135, 4, 929, 8, 20, 7437, 2511, 1, 8243, 23, 791, 18, 3, 19, 5847, 6877, 3573, 3, 3057, 3781, 7297, 2433, 10, 16, 8579, 1759