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: ['f', '217', '449', 't', 'j', '4097', '5561', '8317', '647', 'u', 'b', '7833', 'r', '9011', 'z', '2753', '2183', 'z', 'o', 'g', '7541', 'b', '8795', '327', 'v', 'e', 't', 'l', '4909', 'k', '7681', 'r']

Output: b, e, f, g, j, k, l, o, r, t, u, v, z


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: ['u', 't', '2861', '4309', '8833', '8035', 'r', 'n', 'w', '9419', '5511', '8517', 'a', 'v', '3279', '8773', 'l', 'e', 'b', 'f', '3493', 'u', 'q', '719', 'd', 'y', 'w', '4799', 'c', '5903']


Output: a, b, c, d, e, f, l, n, q, r, t, u, v, w, y