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: ['t', 'c', 'r', '4459', 'o', '1407', 'x', '1515', '331', 'm', '1535', 'p', 'u', 'g', '2513', 'o', '7827', '8149', 'd', 'z', 'q', '5655', 'x', '9997', '2809', 'g', 'h', '6309', 'a', 'j', '9773', '2115', 't', '9113', 'q', 'o', '427', 's', '3815', '5423', 's', 'n', 'i', 'o', '3643']

Output: a, c, d, g, h, i, j, m, n, o, p, q, r, s, t, u, x, z


Input: Consider Input: ['9117', '1153', 'f', 'b', '9979']

Output: b, f


Input: Consider Input: ['u', 'x', 'm', '1515', 'q', 'a', '9079', 'x', 'f', 'n', 'b', '2299', '2207', '5967', 'g', 's', 'q', 'q', 'h', '9603', '297', 'o', 'x']


Output: a, b, f, g, h, m, n, o, q, s, u, x