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: ['6655', '7445', '1795', '7495', 'h', 'z', 'u', '2199', 'r', 'p', '2245']

A: h, p, r, u, z
****
Q: ['1233', '405', '8901', '7147', '8841', 's', 'v', '3131', 'p', 'd', 'y', '5873', '439']

A: d, p, s, v, y
****
Q: ['m', 'm', 'h', '6599', '1033', '9567', 'n', 'y', 'v', '1785', 'o', 'a', 'w', '8183', 'j', '6257', '4849', 'l', '2161', '1745', '8515', 'a', '1741', '7645', '7431', '6367', '7515', '6465', 'p', 'j', 'y', '2735']

A:
a, h, j, l, m, n, o, p, v, w, y
****