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: ['z', 'F', '5389', 'A', 'O', 'L', '1831', 'x']

26, 6, 5389, 1, 15, 12, 1831, 24