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: ['o', '5503', '5837', '4539', '7631', 'm', '2641', 'p', '7901', '8117', 'z', '3373', '3215', 'v', 'a', '5949', 'w', '9049', 'd', 'a', 'l', 'v', 'l', 'n', 'w', 'r', 'j', '9031', '9609', '4209', 'c', '7453', '5855', '2883', '5941', 't', '4283', 'x', 'x', 'n', 'c']

Output: a, c, d, j, l, m, n, o, p, r, t, v, w, x, z


Input: Consider Input: ['7065', 'q', 't', '3177', '9035', 'i', 'l', 'd', '8961', '1183', '6507', 'u', 'c', 't', '2467', '7659', 'e', '8963', 'j', 'g', 'p', '6779', '7115']

Output: c, d, e, g, i, j, l, p, q, t, u


Input: Consider Input: ['2887', 'n', '9011', '9473', '9061', '5923', '1099', '7523', '4359', 'c', '3053', '5073', 'f', 'k', '7273', 'k', '5557', '5561', 't', '8157', '2599', '2327', 'b', '2659', 'x', 'u', 'k', 'x', '1789', 's', 'o', 'a', '2931', '7623', 'w', '615', '8259']


Output: a, b, c, f, k, n, o, s, t, u, w, x