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: ['n', '6117', '3957', 'Q', 'P', '8781', '1469', 'y', 'b', '3081', '4819', 'b', '5713']

14, 6117, 3957, 17, 16, 8781, 1469, 25, 2, 3081, 4819, 2, 5713