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: ['w', 'a', 'm', 'd', '409', 'm', 'v', 's', '7801', 'l', '8551', 'k', '867', 'n', '7731', 'z', '3773', '9137', 'v', 's', 'p', 'p', 'f', 'z', 'g', 'q', 'g', '877', '697', '2057', '8389', '2399', '5263', '2761', '9841', '1781', 'l', '8023']

Output: a, d, f, g, k, l, m, n, p, q, s, v, w, z


Input: Consider Input: ['x', 'j', '9747', 'i', '2015', '3505', 'q', 'n', 'h', '3011', 'u', '8043', 'j', 'f', 'd', 'a', 'p', '5817', 'l', 'q', '2275', 'n', '7085', '5373', 'l', 'g', 'b', '8043', '3085']

Output: a, b, d, f, g, h, i, j, l, n, p, q, u, x


Input: Consider Input: ['55', '3045', '5729', 'o', '4693', '8497', 'm', 'u', '6175', '7335', 'l', '6789', '3609', 'f', '4573', '2687', 't', 'a', 'n', '8393', 'h', 'o', '2521', 'i', '8021', 'd', 'w', 'n', '5887', 'q', '4035', '3547', '4485', '6003', '6599', '2683']


Output: a, d, f, h, i, l, m, n, o, q, t, u, w