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: ['x', 'Z', 'X', '8471', 'b', '7889', 'w', '9919', 'q', '6359', '1429', 'V']

24, 26, 24, 8471, 2, 7889, 23, 9919, 17, 6359, 1429, 22