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: ['9679', 'Y', 'R', '4097', '1783', 'A', 'J', 'D', '6443', '5301', '5847', 'T', 'b', 'k', '5447', '2671', '3207', '5329', '5829', 'O']

9679, 25, 18, 4097, 1783, 1, 10, 4, 6443, 5301, 5847, 20, 2, 11, 5447, 2671, 3207, 5329, 5829, 15