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: ['O', '6529', 'h', '6265', 'h', 'c', '4655', 'i', 'e', 'S', 'G', '5649', '6289', 'a', '4915', '8835', 'w', 'e']

15, 6529, 8, 6265, 8, 3, 4655, 9, 5, 19, 7, 5649, 6289, 1, 4915, 8835, 23, 5