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: ['2415', 'l', '7973', 'w', 'n', '7555', '7987', 'y', '8535', '3735', 'S', '9471', '3021', '8251', '4823', 'h', 'e', 'h', '9463', 'E', '5293', 'A', 'h', '6679']

2415, 12, 7973, 23, 14, 7555, 7987, 25, 8535, 3735, 19, 9471, 3021, 8251, 4823, 8, 5, 8, 9463, 5, 5293, 1, 8, 6679