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: ['Q', '8921', '7131', '9247', '3351', '4689', 'L', 'O', 'N', 'g', 'Q', '413']

17, 8921, 7131, 9247, 3351, 4689, 12, 15, 14, 7, 17, 413