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.

['1649', 'l', 'i', '5901', 'o', 'g', '1197', 'a', '9327', '9835', '1095', 'k', '4489', '9149', 'o', '3095', 'z', 'u', 'y', '561', '7419', 't', 'j', '8763', 'v', '339', 'y', 'w', 'v', 'v', '1867', 'd', 'r', 'w', 'h', 'j', '1531', '3841']
a, d, g, h, i, j, k, l, o, r, t, u, v, w, y, z

['3611', '6825', 'j', 'e', 'r', 'a', '8889', 'y', 'x', 'k', '2651', '4545', '2289', 'r', 'q', '3163', 'a', 'i', 'j', 't', 'b', '2673', '4307', 'q', '5839', 'w', 'g', '6221', 'g', 'h', 'h', '5815', 'n', '3551', '7709', 'z', '2281', '7987', 'w', 'a', '2319', '3337', '3409']
a, b, e, g, h, i, j, k, n, q, r, t, w, x, y, z

['8737', '9059', '3115', '5105', '2549', 'v', 'm', 'l', 'u', '3063', '2355', 'c', '2731', '8787', '2155', '6491', '147', 'e', '8989', '7465', '7221', '3823', 'o', '3453', 'l', 'j', 't', '6653', 'o', 'l', 'a', '1777', 'r', 'n', '6577', 'y', 'a', 'k', '8833', '721', '945']

a, c, e, j, k, l, m, n, o, r, t, u, v, y