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: ['9237', '9757', '4399', '6615', '5893', 'l', '7301', 'C', '1533', 'F', 'A', '8937', '6217', 'q', 'S', '1837', '4671', 't', '6051']

9237, 9757, 4399, 6615, 5893, 12, 7301, 3, 1533, 6, 1, 8937, 6217, 17, 19, 1837, 4671, 20, 6051