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: ['f', '8815', 'c', '3235', 'y', '6241', 'M', '4537', '2721', '6713', 'I', 'D', '305', 'F', 'U', '7839', 'n', '1645', '5739', '4769', 'Q', 'Q', '1527', '2357', 'j', '6297', 'a', 'a', '8067', '613', 'B', '6283']

6, 8815, 3, 3235, 25, 6241, 13, 4537, 2721, 6713, 9, 4, 305, 6, 21, 7839, 14, 1645, 5739, 4769, 17, 17, 1527, 2357, 10, 6297, 1, 1, 8067, 613, 2, 6283