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: ['P', 'H', '4257', '8531', '5967', 'w', 'F', 'E', 'K']

16, 8, 4257, 8531, 5967, 23, 6, 5, 11