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', '535', '6291', '8035', 'O', '967', 'z', 'W', '9165', 'X']

26, 535, 6291, 8035, 15, 967, 26, 23, 9165, 24