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: ['8745', '2367', '9443', '7163', 'H', '507', '9281', '3229', '6953', '687', 'r', '9679', 'R', 'R', '3835', '6759', '9447', '3409', 'a', '2207', '7545', 'f', 'x', '4423', 'W', 'Z', 'P', 'C', 'Q', 'J', '1517', 'q']

8745, 2367, 9443, 7163, 8, 507, 9281, 3229, 6953, 687, 18, 9679, 18, 18, 3835, 6759, 9447, 3409, 1, 2207, 7545, 6, 24, 4423, 23, 26, 16, 3, 17, 10, 1517, 17