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: ['t', '2273', '5019', '2867', 'y', '1725', '1665', '2711', '8563', '6743', '957', 'L', 'L', '475', 'J', '3985', 'K', 'R', '2297']

20, 2273, 5019, 2867, 25, 1725, 1665, 2711, 8563, 6743, 957, 12, 12, 475, 10, 3985, 11, 18, 2297