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', 'I', 'v', 'D', 'W', '9899', '7001', '3567', '2977', '1841', '3155', 'O', 'M']

26, 9, 22, 4, 23, 9899, 7001, 3567, 2977, 1841, 3155, 15, 13