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: ['8171', 'Z', 'Q', '867', 'N', '4539', '105', '9399', '7623', 'b', '9261', '9669', 'j', 'U', '6313', '6059', 'o', 'o', '7615', 's', 'O', '5189', 'v', 'h', '5239', 'r', 'V', 'z']

8171, 26, 17, 867, 14, 4539, 105, 9399, 7623, 2, 9261, 9669, 10, 21, 6313, 6059, 15, 15, 7615, 19, 15, 5189, 22, 8, 5239, 18, 22, 26