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: ['N', 'A', 'I', '609', 'A', 'B', 'T', 'S', '3145', '3639', 'w', 'y', 'h', '3061', '697', '7005', 'D', 'h', 'm', '1155', '4249', '4755', 'E', 'j', 'P', 'Z', 'A', '1323', '3745', '515']

14, 1, 9, 609, 1, 2, 20, 19, 3145, 3639, 23, 25, 8, 3061, 697, 7005, 4, 8, 13, 1155, 4249, 4755, 5, 10, 16, 26, 1, 1323, 3745, 515