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: ['8579', 'z', 'C', 'P', '603', 'x', 'g', '7679', 'o', '1647', 'Z', 'W', 't', '2229', 'h', '697', '627', 's', 'R', '2487', '6553', '899', 'Y', 'f', 'H', '9147']

8579, 26, 3, 16, 603, 24, 7, 7679, 15, 1647, 26, 23, 20, 2229, 8, 697, 627, 19, 18, 2487, 6553, 899, 25, 6, 8, 9147