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: ['h', '1797', '8211', 'n', 'r', '7707', '2063', '4655', 'x', '5521', '8327', 'g', '7659', 'i', 'x', 'w', '9465', '4625', 'q', '5377', 'r', '225', 'r', 'i', 'e', '4163', 'g', 'g', '3537', 's']

A: e, g, h, i, n, q, r, s, w, x
****
Q: ['h', 'g', '4563', 'v', 'm', '107']

A: g, h, m, v
****
Q: ['2687', 'e', '1375', '8381', 't', 'q', 'g', 'f', 'j', 'v', 'h', 'c', 'f', '2677', 'y', 'a', '1655', 'z']

A:
a, c, e, f, g, h, j, q, t, v, y, z
****