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: ['G', 'C', '9509', 'h', 'y', 'u', 'N', '5227', '6643', 'u', '1285', '1165', '5577', '1631']

7, 3, 9509, 8, 25, 21, 14, 5227, 6643, 21, 1285, 1165, 5577, 1631