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: ['3627', '2051', '3203', 'c', 'r', 'a', '1453', 'e', 'z', 't', '1093', '4651', 'a', 'f', '8159', '9623', 'l', 't', 'r', '6963', '7071', '8103', '3493', 'y', '2369', '609', '2011', 'f', '187', 'f', 'c']

Output: a, c, e, f, l, r, t, y, z


Input: Consider Input: ['q', '8149', '4087', '5183', 't', 'j', 'e', 'g', 'r', '2125', 'y', 'l', 'g', '3673', 's', 'r', 'e', 'v', '4259', 'v', '3477', '9353', '3639', 'v', 'n', 'e', 'z', '5071', 'x', '6287', 'e', 'e']

Output: e, g, j, l, n, q, r, s, t, v, x, y, z


Input: Consider Input: ['8403', 's', 'f', '5849', '9727', 'x', 'p', '1067', 'n', 'c', '9481', '9687', 'q', '445', 'q', 'u']


Output: c, f, n, p, q, s, u, x