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]: ['2103', '7937', 'v', '7641', '6609', '269', '4463', '4333', 'c', '8407', '4883', '6283', 'a', '8643', '3365', '1929', 'v', 'o', '2107', '7453', '9157', '5581', '5187', 'f', 'k', '8227', '6295', 'b', 'y', '4995', '1187', 'k', 'n', 'p', 'z', '8165', 'n', '7345', 'l']
[EX A]: a, b, c, f, k, l, n, o, p, v, y, z

[EX Q]: ['747', '5385', '5313', 'p', '9581', 'r', '1339', '3919', 'e', 'e', '8057', '7739', 'i', 'e', '3311', '963', 'g', 'h', '7349', 'y', '1493', 'e', '3055']
[EX A]: e, g, h, i, p, r, y

[EX Q]: ['6133', 'z', '4677', 't', '841', '6275', '4753', 'w', '8459', '3171', 'u', '827', '3463', '8865', 'd', 'r', 'i', '3965', '9801', '8959', '5635', '985', '1915', '889', 'q', '4855', '9889', 'l', 'i', '4095']
[EX A]:
d, i, l, q, r, t, u, w, z