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: ['m', '5005', 'y', 'h', 'w', '3609', 'p', '2539', '3307', 'p']

A: h, m, p, w, y
****
Q: ['a', 'w', 'm', 'g', 'c', '5475', '7391', 't', '1049', 'p', 'd', '1397', 'k', 'x', 'j', '2525', 'f', '741']

A: a, c, d, f, g, j, k, m, p, t, w, x
****
Q: ['f', 'q', 'd', '3315', '4655', 'l', 'o', 'g', '2751', 'a', '263', '8389', '9293', 'v', '1373', '9179', 'm', '3139', 'u', 'r', '785', '5245', '3889', 'c', 'm', 'f', 'k', 'z', '6031']

A:
a, c, d, f, g, k, l, m, o, q, r, u, v, z
****