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.

Input: Consider Input: ['2799', '7519', '345', 'e', 'l', '9369', '4703', '4111']

Output: e, l


Input: Consider Input: ['h', 'v', '1263', 'y', '3299', 'd', 'a', 'h', 's', '2007', '7597', '1015', 'k', '6643', '6959', 'g', 'u', 'd', '5737', 'n', 'z', 'y', 'b', 'g', '9059', '7349', 'j', 'w', 'i', 'z', 'p', '5809', 'x', '4421', 'g', '6399', '3965']

Output: a, b, d, g, h, i, j, k, n, p, s, u, v, w, x, y, z


Input: Consider Input: ['p', 'r', 'y', 'q', 'e', 'z', 'h', '1271', 'l', 'c', 'w', '6163', '2269', '9503', '3177', '2813', 'z', 'u', '2993', '117', '2369', 'l', '6513', '2247', '6473', 'u', '1889', 'h', '4093', 'o', '6419']


Output: c, e, h, l, o, p, q, r, u, w, y, z