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', '6867', '7965', '3313', 'k', '1827', '7337', 'u', '1209', '5145', 'w', 'h', '9059', 'u', 'b', '3189', '2837', 'k', 'y', 'e', 'b', '4479', '541', '7103', 'h', 'm', '2177', '6377', '3993', '7167', 'q', '2145', '5007', '9135', '5331', 'e']

Output: b, e, g, h, k, m, q, u, w, y


Input: Consider Input: ['o', '4169', 'k', '7349', 'w', 't', '8271', '8781', '3725', '2865', '6053', 'j', 'z', '4211', '8231', '213', '6389', 'f', 'h', 'g', '9269', '4617', '4137', 'i', 'y', 'i', 'n', '4597', 'p', 'z', '3195', '3231', 'c', '1901', '1231', 'p', '4509', '2557', '3715']

Output: c, f, g, h, i, j, k, n, o, p, t, w, y, z


Input: Consider Input: ['n', '9037', '8441', 'i', 'a', '2011', 'q', 'w', 'i', 'y', '3083', 'r', 'q', '3051', 'c', '551', '3271', '4051', '5725', 'j', 'x', 'p', '8279', '2765', 'i', '8961', '5885', 'c', 'b', 'p', 'j', '7981', '6779', 'a', '1177', 'n', 'o']


Output: a, b, c, i, j, n, o, p, q, r, w, x, y