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: ['Q', 'W', 'E', 'B', 'l', '8999', '6825', 'W', 'Q', '9183', '7939', '9513', 'T', '7359', 'w', '9861', 'w', 'U', '2653', 'S', '7019', '4365', '5855', 'U', 'm', '9589', 'J']

17, 23, 5, 2, 12, 8999, 6825, 23, 17, 9183, 7939, 9513, 20, 7359, 23, 9861, 23, 21, 2653, 19, 7019, 4365, 5855, 21, 13, 9589, 10