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: ['i', 'i', 'h', 'g', '5123', 'i', 'r', '3183', 'w', 'g', 's', '9777', '455', 'l', 'r', 'h', 'e', 's', 'v', '6823', '463', '9603', 'e', '947', '7071', 'c', '3373', 'j', 'w', 'm', 's', 's', '3483', '9567']
Example Output: c, e, g, h, i, j, l, m, r, s, v, w

Example Input: ['t', 'h', '6141', 'g', 'f', 'z', 'n', 'b', 'k', '9059', 'y', 'p', '4289', '2683', 'a', '3267', 'w', 'p', 't', '3623', '7759', 'a', 'o', 'm', '9815', 'q', 'u', '8051', '6871']
Example Output: a, b, f, g, h, k, m, n, o, p, q, t, u, w, y, z

Example Input: ['8381', '1235', '5363', 'i', 'l', 't', 'o', 'z', 'b', '1295', '6991', 'l', '1323', '5511', 'r', 'u', 'u', 'k']
Example Output:
b, i, k, l, o, r, t, u, z