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.

Ex Input:
['8357', 'x', 'w', '287', 'z', '2733', '1757', 'w', 'g', '1393', '7201', '4931', 'k', '5185', 'x', '6313', '2255', 'z', 'v', '3593', '6191', '4423', 'm', 'k', '3209', '3559', 'c', 'n', 'm', '5461', '2997', '235', '4045', '6597', 'v', 'e', 'p', 'c', 'k', 'd', '5529', '6241', 'u', 'f', '8067']

Ex Output:
c, d, e, f, g, k, m, n, p, u, v, w, x, z

Ex Input:
['z', '2519', '4799', '4715', '7165', 'r', 'r', 'l', 'n', '6925', '8935', '9795', '5489', 'v', 'u', '6527', '2241', 'u', 'c', 'w', '9755', 'w', '9823', 'g']

Ex Output:
c, g, l, n, r, u, v, w, z

Ex Input:
['k', '2943', 's', 'i', '531', 'm', 'g', '2677', '8293', '5249', '5459', 'j', 'z', '1843', 'i', '3543', 'q', '1765', 'w', '8507', '7981', '9399', '803', '255', '751', 'k', '5423', '8023', '8243', '4635', 'v', 'v', '6415', '5751', '9417', 'i']

Ex Output:
g, i, j, k, m, q, s, v, w, z