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: ['k', 'A', 'L', 'A', 'V', 'f', '251', 'Z', 'b', '8497', 's', '6691', 'p', '6261', '5471', '4355', '1549', 'i', '9561', 'L', '9455', '5267', '4833', '3957', 'C', '7251', '1801', '5457', 'e', 'Q', '8857', '6105', 'X']

11, 1, 12, 1, 22, 6, 251, 26, 2, 8497, 19, 6691, 16, 6261, 5471, 4355, 1549, 9, 9561, 12, 9455, 5267, 4833, 3957, 3, 7251, 1801, 5457, 5, 17, 8857, 6105, 24