In this task, you are given an input list A comprising of numbers and alphabets. You need to extract and sort the unique alphabets in the list. The alphabets in the input list will only be in lowercase. Return -1 if there is no alphabet in the input list.

Input: Consider Input: ['i', 's']

Output: i, s


Input: Consider Input: ['5737', 'b', 'e', 't', '7419', 'n', 'y', '5225', '6485', 'b', '1343']

Output: b, e, n, t, y


Input: Consider Input: ['x', 'c', 'c', 'u', '35', '8725', '7567', 'r', 'k', '8413', '231', 'z', '4897', '6019', '2025', 'y', 'f', '4445', '9225', '8267', '4269', '1493', 'b', 'f', 'r', 'd', '6717', '969', '213', '5659', '4929', '617', 'h', 'j', 'g', 'w', 'n', '1733', '1055', '9487']


Output: b, c, d, f, g, h, j, k, n, r, u, w, x, y, z