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: ['I', '511', '5999', '5367', '1039', '6401', '663', 'R', '8679', '2517', 'J', '5917', 'b', 'g', 'I', '973', '9643', 'C', 'h', 'M', 'I']

9, 511, 5999, 5367, 1039, 6401, 663, 18, 8679, 2517, 10, 5917, 2, 7, 9, 973, 9643, 3, 8, 13, 9