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: ['2897', 'G', 'p', '8757', '9335', '103', 'U', 'B', '2921', '8725', 'I', '9165', 't', '309', '4475', '815', 'K', '3777', 'I', 'x', 'Z']

2897, 7, 16, 8757, 9335, 103, 21, 2, 2921, 8725, 9, 9165, 20, 309, 4475, 815, 11, 3777, 9, 24, 26