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.

['y', 'u', 'c', '5909', 'x', '9865', 'e', 'h', '5125', '4719', 'w', '8855', 'i', 'd']
c, d, e, h, i, u, w, x, y

['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

['2539', '9775', 's', '9631', 'k', 'n', 'k', '2349', '3359', 'z', 'j', '8417', 'd', 'c', '2091', '4157', '5667', 'j', '5045', 'c', 'g', '6407', 'u', 'o', 'x', 'k', '6109', '1043', 'h', '4947', '6649', 'k', '6481', '2811', '9937', '289', 'n', 'a']

a, c, d, g, h, j, k, n, o, s, u, x, z