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: ['4925', 'i', 'q', 'k', '7615', 'r', '7217', 'o', '8097', '9151']

Output: i, k, o, q, r


Input: Consider Input: ['315', '9975', '3013', 's', '6131', 'e', 'e', 'u', 'a', '1729', 'g', 't', 'y', 'f', '7523', 'e', 'g', '489', 'm', 'p', 'f', 'e', '2077', 'e', 'g', 'c', 'l', '6389', 'k', 'b']

Output: a, b, c, e, f, g, k, l, m, p, s, t, u, y


Input: Consider Input: ['8193', '7793', 'e', '3513', '9411', 'r', 't', '361', '6969', '7295', '2581', 'j', '8487', 'h', 's', 'n', 'y', 's', 'k', 'x', 'c', 'r', '9231', '5035', 'r', '9183', '7287', 'i', '9075', 'v', '9381']


Output: c, e, h, i, j, k, n, r, s, t, v, x, y