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: ['k', 'r', 'f', '4369', 'z', 'z', 'l', '143', 'r', '707', '9167', 'g', '1749', 'i']

A: f, g, i, k, l, r, z
****
Q: ['k', '1995', 'b', '2581', 'x', '2639', 'i', '6761', '2701', 'd', '6993', '9375', 'r', 'm', '249', '8115', '8179', 't', '4901', 'i', '6197', '2809', 'e', 's', 'j', '4261', 'f', '6649', '7527', '3839', '5651', '9287', 'n', '2505', 's', 'q', '2825', 'g']

A: b, d, e, f, g, i, j, k, m, n, q, r, s, t, x
****
Q: ['m', '5481', 'b', 't', 'v', '8721', '6431', '1635', 'h', '5163', 'j', '9449', '9245', 'b', '7865', 'g', 'r', 'q', '1299', '8599', '7579', 'v', 'v', '8875', 'd', 'e', 'z', '7913', '6775', 'f', 't', 'x']

A:
b, d, e, f, g, h, j, m, q, r, t, v, x, z
****