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: ['671', '2983', 'O', '3667', '2263', 'p', 'D', '4327', 'i', 'o', 'S', '9781', '9433', '4833', 'R', 'd', 'r', 'B', 'u', 'D', '705', '9505', 'S', '6893', '4679']

671, 2983, 15, 3667, 2263, 16, 4, 4327, 9, 15, 19, 9781, 9433, 4833, 18, 4, 18, 2, 21, 4, 705, 9505, 19, 6893, 4679