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.

Example Input: ['7071', 'h', '837', 'z', 'c', '2217', 'c', '6341', '6607', 'g', '3569', 'a', 'h', 't', 'b', 'f', 'g', 'f', 'l', 'b', 'x', 'o', 'r', '8949', '8071', '1507', 'v']
Example Output: a, b, c, f, g, h, l, o, r, t, v, x, z

Example Input: ['d', '5285', 'z', 't', 'i', '719', 'z', 'b', '3603', '4781', 'o', 'g', 'j', 'd', 'r', 'a', 'x', '5829', '4907', '7395', '993', '2109', '1745', '415', '7525', '1029', '7791', '5321', 'h', '6391', 'g', '4613', '9191', 'o', '7365', '1811', '9695', 'w']
Example Output: a, b, d, g, h, i, j, o, r, t, w, x, z

Example Input: ['1683', '4737', '7807', 'z', 'u', 'a', 't', '603', '6609', '6425', 'm', 'y', 's', '7723', 'c', '8619', '6351', '3497', '4037', 'k', 'k', '5905', '41', 'h', '2639', 'v', 'z', '4513', 'b', '3939', 'u', 'e', '7165', '2593', 'p', '3033', '5649', '4431', '3527', '7347', '3803']
Example Output:
a, b, c, e, h, k, m, p, s, t, u, v, y, z