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: ['R', '6223', 'R', '1571', '945', '973', 'I', '1559', '7843', 'Q', 'U', 'S', '1511', '6115', 'V', '3523', '9139', 'w', 'H', '5697', 'Y', 'Y', 'h', 'B', '1505', '3599', 'e', '9343', '8571']

18, 6223, 18, 1571, 945, 973, 9, 1559, 7843, 17, 21, 19, 1511, 6115, 22, 3523, 9139, 23, 8, 5697, 25, 25, 8, 2, 1505, 3599, 5, 9343, 8571