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: ['D', '5357', 'R', '903', '8689', '297', '8717', 'j', '7337', '5683', 'N', '8123', '5373', '2183', '7879', '2313', '8999', 'O', '141', 'C', '9009', 'w']

4, 5357, 18, 903, 8689, 297, 8717, 10, 7337, 5683, 14, 8123, 5373, 2183, 7879, 2313, 8999, 15, 141, 3, 9009, 23