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', '1919', 'P', '9871', '4029', 'W', '4205', 'O', 'p', '49', 'Z', 's', '9863', 'd', '8423', 'i', '3201', '6945']

14, 1919, 16, 9871, 4029, 23, 4205, 15, 16, 49, 26, 19, 9863, 4, 8423, 9, 3201, 6945