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.

Input: Consider Input: ['f', '3409', 'i', '4147', '1745', '6007', 'l', 'd', 'i']

Output: d, f, i, l


Input: Consider Input: ['k', 'z', '303', 'a', 'f', 'q', 'i', '1475', '3453', 'd', 'w', '4037', 'z', 'h', 'k', '3547', '1561']

Output: a, d, f, h, i, k, q, w, z


Input: Consider Input: ['s', '1401', 'w', 'p', '9213', '9565', 'm', '1473', 'x', 'n', '4455', 'd', '1465', 'o', 'h', 'o', 'i', '4973', 'b', 'u', '8057', 'v', '4483', 'a', '2185', 'w', 'u', 'd', 'e', '6893', 'z', 'l', 'e', '9723', 'r', 'x', 'e', '7271', 'p', 'h', '6697']


Output: a, b, d, e, h, i, l, m, n, o, p, r, s, u, v, w, x, z