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: ['2047', '4403', 'g', '3017', '1627', 'v', 'r', '2237', '5513', 'o', 'v', '7229', '9801', 'j', '443', 'z', 'q', 'y', '7447', '1659', '3411', '55', '5153', '9921', '2195', '1075', '8187', 'p', 'x', 'h', 'y', 't', 'a', 'r', 'f']

Output: a, f, g, h, j, o, p, q, r, t, v, x, y, z


Input: Consider Input: ['6143', 'y', '5505', '9813', 'r', 'v', 'u', '8681', '2387', 'u', 'o', 'm', '9793', 'm']

Output: m, o, r, u, v, y


Input: Consider Input: ['m', 'q', '7623', '3185', '2917', '19', 'v', '2171', '1023', 'k', 'i', '4327', 'm', 'n', '4055', 't', '4181', '5695', '9295', 'w']


Output: i, k, m, n, q, t, v, w