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: ['c', '6027', 'o', 'h', 'l', '7893', 'u', 'f', '7661', '4715', '1373', '4799', 'd', 'z', '411', '4753', 'd', '8241', '1589', '4173', '3921', 'j', 'o', '5067', '8879', 'e', 'm', '9543', '9625', '855', 'u', 'd', '5859', '4243', '5747', '5147', '7315', 'd', 'x', 'q', '7841', '7397', 'm']

A: c, d, e, f, h, j, l, m, o, q, u, x, z
****
Q: ['u', 'i', '1185', '3795', '5417', 'k', 'b', '2629', '2635', 'z']

A: b, i, k, u, z
****
Q: ['m', 'w', '6453', 'x', 'r', '935', '4503', '6479', 'k', '611', 'r', '7141', 'v', '9089', 'n', 'z', '9307', '5123', '1563', 'c', 'x', 'k', 'x', '6463', '9729', '8907', '6027', 'l', '6687', '1197', '7091', 'q', '1901', 'u', 't', '7735', 'v', 'e', '1669', '3111']

A:
c, e, k, l, m, n, q, r, t, u, v, w, x, z
****