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: ['z', 'K', '2321', '5441', '5257', 'F', 't', '2973', '7263', '9205', '1085', '3879', '8297', '451', 'R', 'X', 'x', '9791', '9363', '2983']

26, 11, 2321, 5441, 5257, 6, 20, 2973, 7263, 9205, 1085, 3879, 8297, 451, 18, 24, 24, 9791, 9363, 2983