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: ['d', 'r', '7769', '2159', 's', '3269', '5527', 'l', 'z', 'e', '5165', 'x', 'x', '8273', 'g', 'm', '7609', '4015', '6403', '3753', 'y', 'h', 'l', 'i', '389', 'm', 'u', '6845', 'r', 'c', '7571', '3355', '9755', 'n', '4625', 'p', '5645', '1703', '4439', 't', '8431']
Example Output: c, d, e, g, h, i, l, m, n, p, r, s, t, u, x, y, z

Example Input: ['f', 't', '2135', '8397', '6361', '389', '2253', 'x', 'p', '4833', '5785', 'x', '1811', '9639', '5739', '175', '3231', '5931', 'r', 'c', 'g', 'h', 'p', '909', 'p', '587', 'a', 'a', 'h', 'q', 's', '5945', '4911', 't', 'h', '7517', 'p', '3177', 'h', 'u', '3577', '7055', 'l']
Example Output: a, c, f, g, h, l, p, q, r, s, t, u, x

Example Input: ['5083', 'p', '8147', '539', 'f', '5155', '4585', 'm', '9077', 'k', 'c', '6933', '8153', 'k', 'y', 'v', '7763', 'a', '9783', '5107', '4715', 'p', '8453']
Example Output:
a, c, f, k, m, p, v, y