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: ['c', 'a', 'p', 'p', '4203', '1587', '2953', '9809', '99', '5821', 't', 'i', '4213', '1809', 's', 'l', 'i', 'b', '9233', '3983', '7713', '1807', 'k', 'f', '7825', '5491', 'o', '1347', 'u', 'h', '3967', 'u', 'g', '6775', '1069', '9211', 'i', '3369', 'r']

Output: a, b, c, f, g, h, i, k, l, o, p, r, s, t, u


Input: Consider Input: ['u', '4731', 'l', 'p', '1997', '601', 'n', 'l', 'p', '211', '7355', '6537', 'w', 'x', '1741', '8145', '3689', 'm', 'y', '6945']

Output: l, m, n, p, u, w, x, y


Input: Consider Input: ['w', '9697', '7911', '3979', '3569', '2709', '8979', '7933', '7389', 'z', 'b', '9603', 'f', '5149', 'p', 'd', '5897', '2067', '5819', 'i', '3107', '9427', '2047', 'w', '881', '9091', '9933']


Output: b, d, f, i, p, w, z