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.

['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']
a, f, g, h, j, o, p, q, r, t, v, x, y, z

['z', '8763', '6399', '45', '6731', 'v', '441', '4763', 'u', '8741', 'r', '9143', 'd', 'p', '2241', 'y', '6523', 'y', 'w', '6771', 't', 'r', '9239', '295', 'z', '461', 'b', '9217', '2597', '1249', 'r', 'i']
b, d, i, p, r, t, u, v, w, y, z

['m', '1907', 'o', '2877', '815', '7443', 'l', 'f', 'c', '1235', '9387', 'l', '3659', '8863', 'v', 'm', '3943', '6997', 'v', '1883', '5707', '941', '5683', 'v', 'x', 'h']

c, f, h, l, m, o, v, x