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: ['g', 'h', 'g', 'g', 's', 'h', '2849', '2705', '1185', 'x', '5789', '8221', 'e', 'x', 'g', 'b', '4903', 'q', '1563', 'r', 'k', 't', '9047', 'p', 'p', '9397', 'u', '7473', 'f', 'o', 'y', '1957', '1039', '9905', 'i', '4829', 'q', 'w', 'k', 'p', 't', '563', 'g', 'l']

Output: b, e, f, g, h, i, k, l, o, p, q, r, s, t, u, w, x, y


Input: Consider Input: ['219', '2065', '4045', 'k', 'n', 's', 'z', '7239', '1043', 'r', '2333', 'q', 'k', 'b', '2013', 'g', '6925', '9835', 'a', '5377', 'k', '8005', 'p', '9753', 'm', '201', '2353', 'f', 'n', '89', 'q', 'p', '7847', 's', 'l', '3359', '2269', 'v', 'm', '8247', '9665', 'u', 'w']

Output: a, b, f, g, k, l, m, n, p, q, r, s, u, v, w, z


Input: Consider Input: ['1401', '3467', '6913', '3747', '2391', '3227', '8815', '833', 't', 'p', '7299', 'z', '6851', '4757', '6381', '467', 'v', 'a', '3371', 'f', '2567', '6299', 'n', 's', 'b', 'n', '3211', '4777', '3149', '6395', 'o', '7151']


Output: a, b, f, n, o, p, s, t, v, z