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: ['A', '307', 'z', 'e', 'Z', '5847', 'S', 'A', 'x', 'H', '8659', 'h', 'h', '4247', '31', 'p', 'Y', '6561', '699', '8383', '6955', 'k', 'R', '4723', '9983', 'v', '3153', 'p', '3521', 'H', 'R', 'L']

1, 307, 26, 5, 26, 5847, 19, 1, 24, 8, 8659, 8, 8, 4247, 31, 16, 25, 6561, 699, 8383, 6955, 11, 18, 4723, 9983, 22, 3153, 16, 3521, 8, 18, 12