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: ['y', '7513', 'l', '5333', '5461', 'L', 'Y']

25, 7513, 12, 5333, 5461, 12, 25