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: ['N', 't', '5429', '8909', '2085', '2905', 'o', 'W']

14, 20, 5429, 8909, 2085, 2905, 15, 23