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', '9267', '297', 'u', 'B', 'N', 'A']

24, 9267, 297, 21, 2, 14, 1