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: ['p', 'f', 'h', '1977', '6221', 'i', 'a', 'l', '5225', '8059', 'c', 'w']

Output: a, c, f, h, i, l, p, w


Input: Consider Input: ['n', '7489', 'n', 'n', '9787', '7829', 'n', '3481', 'v', 'l', '8927', 'c', 'm', 'd']

Output: c, d, l, m, n, v


Input: Consider Input: ['z', '9143', '493', '8811', 'h', '1973', 'j', '869', '3707', 'k', '3113', '1459', '1335', 'x', 't', '6347', 's', 'h', 'w', '1721', '7555', '9431', '9285', '915', 'm', 'q', 'w', '7553', '5375', 'm', '727', 'z', 'c', 'k', 't', '4455', '6187', '3475']


Output: c, h, j, k, m, q, s, t, w, x, z