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: ['5433', '4011', '2113', '2299', 'e', '9829', 'd', 'q', 'e', '3921', 'a', 'q', '8953', 'q', 'g', 'w', 'z', 'u', '4425', 'b', 'q', '5315', 'b', 'u', 'h', 'y', '9733', 'b', 'c', '1225', 'a']

Output: a, b, c, d, e, g, h, q, u, w, y, z


Input: Consider Input: ['7301', '7999', 'x', 'r', '6881', 'e', '609', 's', '7495', 'a', 's', '1961', 'q', 'x', '373', '6289', '4847', '5969', 't', '5487', '7639', '9039', '2395', 'b', 'd', '1447', 's', '8137', 's', '443', 'f', 'z', '4823', 'k', 'i', 'o', '4739', 'w', 'f', '8853', 'a']

Output: a, b, d, e, f, i, k, o, q, r, s, t, w, x, z


Input: Consider Input: ['g', 'n', 't', 's', 'k', 'a', '9523', 'j', 'd', '2683', 'y', '8929', '7981', 't', '8167', 'e', '8969', 's', 'f', '6835', 'd', '5127']


Output: a, d, e, f, g, j, k, n, s, t, y