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: ['c', '9125', '6049', '5201', 'v', '9311', 'q', '3305', 'l', 'q', '3387', '3647', 'x', '471', 'a', '5631', 't', '9679', '5423', '2569', 'w', 't', '6397', 'e', 'h', 'c', 'v', 'v']

Output: a, c, e, h, l, q, t, v, w, x


Input: Consider Input: ['f', 't', '2135', '8397', '6361', '389', '2253', 'x', 'p', '4833', '5785', 'x', '1811', '9639', '5739', '175', '3231', '5931', 'r', 'c', 'g', 'h', 'p', '909', 'p', '587', 'a', 'a', 'h', 'q', 's', '5945', '4911', 't', 'h', '7517', 'p', '3177', 'h', 'u', '3577', '7055', 'l']

Output: a, c, f, g, h, l, p, q, r, s, t, u, x


Input: Consider Input: ['5049', '6195', '9833', 'k', '2601', '6309', '6087', '7753', 'l', '6927', '427', '967', '7985', '8077', 'e', 't', '7213', '5019', '9947', '187', '9891', '4445', '4329', '811', '5', '3739', '5577', 'r', 'a', '285', '5849', 't', '6231']


Output: a, e, k, l, r, t