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.

[Q]: ['1233', '405', '8901', '7147', '8841', 's', 'v', '3131', 'p', 'd', 'y', '5873', '439']
[A]: d, p, s, v, y


[Q]: ['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']
[A]: c, d, e, f, g, k, m, n, p, u, v, w, x, z


[Q]: ['l', 'a', '3805', '8177', '7699', 's', '5165', 's', '5143', '4617', 'w', '3163', '23', 'f', 'a', 'u', 'n', 'i', '6905', '1047', '453', '8955', '5473', 'k', 'v', 'a', 'z', 'f', 'o', '2147', '2915']
[A]:
a, f, i, k, l, n, o, s, u, v, w, z