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: ['1593', '8165', 'q', '6689', 'b', 'r', '373', 'g', '6505', '415', '495', 'j', 'j', 'f']

A: b, f, g, j, q, r
****
Q: ['w', '9437', 's', '9819', 'q', 'q', '4443', 'p', '377', '6777', 's', 'x', 'a', 'o', '9205', '9289', '7103', 'k', 'l', '9453', '9043', 'k', 'r', 'g']

A: a, g, k, l, o, p, q, r, s, w, x
****
Q: ['5299', '621', 'm', '3281', '1495', 'u', '8339', '2413', '9531', 'y', 'r', '1361', '7219', '9369', 'u', 'z', '3349', '1929', '9819', '2681', 'y', '813', 'j', '775', 'i', 't', '1663', 'k', 'p', 'q', '6417', 'z', 'e', '9731', '2835', 'm', 'k', '2837']

A:
e, i, j, k, m, p, q, r, t, u, y, z
****