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', 'c', '7209', '7351', '5253', 'C', 'Y', '9313', 'P', 'X']

17, 3, 7209, 7351, 5253, 3, 25, 9313, 16, 24