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: ['e', 'n', 'y', 'f', 'l', 'h', '455', 'y', '591', 'm', '9041', 'b', 'b', 'o', '4215', '5009', 'o', 'a', '4369', 'u', '6911', '4825', 't', 'k', '6063', '2939']
Example Output: a, b, e, f, h, k, l, m, n, o, t, u, y

Example Input: ['5345', 'f', '6605', 's', 'q', 'w', 'p', 'o', 's', 'u', 'i', '7339', '8379', 'h', '9547', 'b']
Example Output: b, f, h, i, o, p, q, s, u, w

Example Input: ['6307', '2677', 'z', 'c', '5943', 'k', '8447', '4487', 'q', 'c', 'd', '3829', '1395', '4047', '3339', 'w', '4671', '5845', 'l', 'r', 'k', 'e', '9201', '1425', '1019', '5047', '3539', '1037', 'm', 'f', 'y', 'q', '6151', '6303', 'v', 'v', 'p', '9357', 'z']
Example Output:
c, d, e, f, k, l, m, p, q, r, v, w, y, z