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: ['6525', '9115', '5741', '3015', 'Q', '1607', 'O', 'I', '2977', 'N', '1577', 'U', '3871', 's', 'R', '623', '6461', 'G', '5963', 'p', '1101', '4923', '4339', '5393', '7937', 'W', 'k', 'L', '5097', 'l', 'b', 'U', '5385', 'X', '5637', 'c']

6525, 9115, 5741, 3015, 17, 1607, 15, 9, 2977, 14, 1577, 21, 3871, 19, 18, 623, 6461, 7, 5963, 16, 1101, 4923, 4339, 5393, 7937, 23, 11, 12, 5097, 12, 2, 21, 5385, 24, 5637, 3