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.

Q: ['4993', '6641', '3127', '9409', '8453', '5909', '6109', 'y', 'f', '6859', 'c', '3863', 't', '1221', '3689', 'w', 'h', '7947', 't', '5979', 'l', 'i', '1321', '3149', 'l', 'v', '3825', 'z', '9297', 'f', 'e', '7205', 'a', 'a', '2645', '391', '4965', 'w', 'h', '7715', '9409', '3603', '4147']

A: a, c, e, f, h, i, l, t, v, w, y, z
****
Q: ['477', '3931', 'g', '5967', 'm', '9845', '1607', 'a', '1749', 'k', 'j', '7945', '9125', 'v', 'n', 's', '5185', '1117', '17', 'x', '4149']

A: a, g, j, k, m, n, s, v, x
****
Q: ['4175', 'i', '6327', 'e', 'n', '1327', '9873', 'u', '4119', '1349', '6063', '8939', '5917', '455', '6725', '5097', 'c', 'n', 'u', 'b', '8097', '6567', 'n', '5783', '4513', '8033', 'z', '2619', '7335', 'q', '3959', 'f', 'r', '4043', 'm', 'c', '2313', 'w', '9229', 'd', '5355', '3721', 'x']

A:
b, c, d, e, f, i, m, n, q, r, u, w, x, z
****