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.

['1367', 'h', '4153', '1587', 'h', 'b', 'n', 'u', 'n']
b, h, n, u

['c', '1693', 'l', 'u', 'x', '3609', 'h', '4159']
c, h, l, u, x

['d', '8489', 'j', '7629', '2851', 'd', '1781', '5287', '8393', '2957', 'e']

d, e, j