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', '3151', '8433', 'm', 'G', '9245', '8975', '4839', 'L', 'z', 'c']

25, 3151, 8433, 13, 7, 9245, 8975, 4839, 12, 26, 3