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: ['O', '1397', '4105', '9265', 'd', '2327', 'J', '3937', 'b', '9315', 'L', 'n', '2361', 'F', 'y', 'z', 'C', 'm', '903', 'y', '4797', '2377', '6109', '6921', 'f']

15, 1397, 4105, 9265, 4, 2327, 10, 3937, 2, 9315, 12, 14, 2361, 6, 25, 26, 3, 13, 903, 25, 4797, 2377, 6109, 6921, 6