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: ['1475', 'U', '801', '6217', '8809', '5015', 'K', '8151', '6605', 'C', 'w']

1475, 21, 801, 6217, 8809, 5015, 11, 8151, 6605, 3, 23