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: ['9449', '3503', '7363', 'o', '9401', '5015', '5739', '1889', '6953', 'W', 'K', '8447']

9449, 3503, 7363, 15, 9401, 5015, 5739, 1889, 6953, 23, 11, 8447