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.

['8741', 'h', '2147', '373', 'c', 'r', '2639', '3511', '1393', 't', '7173', 'f', '9371', '7659', 'q', '4799', 'f', '1967', '1905', '8783', 'i', 'n', 'z', '6395', 'u', 'i', '1493', '1395', '1909', '477', 'i', '8547', '393', '2203', '6893', 'y', '2085', '6445', '7753', '4027', 'h', 'y', '7963']
c, f, h, i, n, q, r, t, u, y, z

['n', '7489', 'n', 'n', '9787', '7829', 'n', '3481', 'v', 'l', '8927', 'c', 'm', 'd']
c, d, l, m, n, v

['q', 'v', '7673', '6733', '5355', '7549', 'b', '6985', 't', '7711', 't', 'n', '6803', 'l', 'y', 'r', 'k', 'l', '6769', '6159', '339', '9273', '3', 'y', '9605', 'x', '5541', '4035', '2035', 'z', 's', 'i', 'y', '6565', '7571', 'a', 'u', 'f', 'v']

a, b, f, i, k, l, n, q, r, s, t, u, v, x, y, z