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 Q]: ['c', 'a', 'p', 'p', '4203', '1587', '2953', '9809', '99', '5821', 't', 'i', '4213', '1809', 's', 'l', 'i', 'b', '9233', '3983', '7713', '1807', 'k', 'f', '7825', '5491', 'o', '1347', 'u', 'h', '3967', 'u', 'g', '6775', '1069', '9211', 'i', '3369', 'r']
[EX A]: a, b, c, f, g, h, i, k, l, o, p, r, s, t, u

[EX Q]: ['5161', 'v', 'y', '6005', 'y', 'l', '5451', 'z', 'j', 'd', '4597', '9319', '1241', 'g', 'f', 'b', 'g', '683', '763', 'm']
[EX A]: b, d, f, g, j, l, m, v, y, z

[EX Q]: ['5771', '8757', '4929', '8745', 'o', '773', '3359', '3347', '5869', '1687', '9015', 'c', 'a', '4827', '7067', '8357', 'e', 'c', '517', '6751', 's', '3011', '5841', 'r', 'a', 'm', 'v', 'k', '7659', 'v', 'r', '9911']
[EX A]:
a, c, e, k, m, o, r, s, v