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: ['f', 'p', 'n', '839', '9229', 'r', '7661', 'c', '4383', 'u', 'k', '5321', '3181', '1785', 'w', 'k', '8721', '7855', '4093', '6495', 'q', '2467', 'g']

Output: c, f, g, k, n, p, q, r, u, w


Input: Consider Input: ['9483', '501', 'j', 'k', '3103']

Output: j, k


Input: Consider Input: ['9915', '4157', 'x', '1239', '4373', 'b', 'n', 'a', '3749', 'h', '4333', 'h', '7723', '3253', '7945', '3721', '6763', '2989', '6335', '4175', '1735', 'g', '9897', 'l', '1019', '7837', 'w', '2847', 'h', '6541', '4863', 'b', '3067', '2589', 'u', 'f', '7577', '8679', '8369', '1033', '1717', '9881']


Output: a, b, f, g, h, l, n, u, w, x