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: ['9923', 'x', '1901', 'v', '1459', '7503', '3829', '4929', 'k', 'c', '3329', '8793', 'n', 'a', '7249', 'b', 'l', 'l', 'm', 'p', 'b', 'a']

Output: a, b, c, k, l, m, n, p, v, x


Input: Consider Input: ['8741', 'h', '2147', '373', 'c', 'r', '2639', '3511', '1393', 't', '7173', 'f', '9371', '7659', 'q', '4799', 'f', '1967', '1905', '8783', 'i', 'n', 'z', '6395', 'u', 'i', '1493', '1395', '1909', '477', 'i', '8547', '393', '2203', '6893', 'y', '2085', '6445', '7753', '4027', 'h', 'y', '7963']

Output: c, f, h, i, n, q, r, t, u, y, z


Input: Consider Input: ['7365', '1865', 'w', '7027', 'g', '6737', '6309', '6857', 'i', 'l', 'z', '4739', '1515', 'm', 'h', '6117', 'k', '5915', 'w', '2101', 'x', '7963', '413', 'a', '1155', '3235', 'c', '6911', '4131', '3305', 'n', 'u', '2699', '1941', '6287', '9369', 't', 'j', 'u', '2087', '545', '8675', 'l', '7965']


Output: a, c, g, h, i, j, k, l, m, n, t, u, w, x, z