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: ['W', 'z', '7283', 'p', 'p', 'V', 'R', 'F', '8705', 'S', 'O', '3953', '7549', '2063', '6567', '5381', '4269', '9121', '8591', '8435', '3461']

23, 26, 7283, 16, 16, 22, 18, 6, 8705, 19, 15, 3953, 7549, 2063, 6567, 5381, 4269, 9121, 8591, 8435, 3461