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: ['9221', 'v', 'o', 'O', '9863', '3613', '1917', 'm', 'n', 'k', 'q', 'G', 'b', 'C', 'Q', '5403', 'f', 'l', 'N', '1757', 'r']

9221, 22, 15, 15, 9863, 3613, 1917, 13, 14, 11, 17, 7, 2, 3, 17, 5403, 6, 12, 14, 1757, 18