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: ['m', '7517', '9361', '9567', '8785', 'k', '5699', '3585', 'v', '1913', '1651', 'g', 'p', '2731', 'q', 'h', '467', 'r', '1091', '9801', 'a', '6645']

Output: a, g, h, k, m, p, q, r, v


Input: Consider Input: ['5611', 'x', 't', 'p', '5711', '7079', '5251', '429', 'z', 'u', '8721', '9321', '79', 'i', '189', '3605', 'k', '445', 'r', 'k', 'o', '2189', '8521', '8849', '2651', 'm', '4149', '1577', '3085', '5275', '6413', '5265', '6089', 'r', 'f', '5013']

Output: f, i, k, m, o, p, r, t, u, x, z


Input: Consider Input: ['3965', 'b', '8293', '909', '2719', '1315', '9247', '1705', 'f', 'x', 'l', '143', '9313', '3591', 'g', 'l', 'n', 'm', 'i', 'q', 'p', '6751', '8419', '1079', '6833', 'f', '8425', '3721', 'b']


Output: b, f, g, i, l, m, n, p, q, x