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: ['5431', 'o', 'u', 'l', 'f', 'd', 'r', '1479', '9357', 's', 'v', '6399', 'b', '7937', 't', '8497', 'r', '131', 'h', 'c', 'v', '8879', 'k', 'r', '4687', 'l', '1065', 'r', 'w', 'l', '3305', '461', 'q', 'h', 'b', 'e', 'e', 'w', '5999']

Output: b, c, d, e, f, h, k, l, o, q, r, s, t, u, v, w


Input: Consider Input: ['6737', 'g', '9985', '5257', 'k', 't', '7863', 'y', '8319', 'l', 'o', '6505', '6531', 'z', '3055', '2943', '3625', 'h', '4867']

Output: g, h, k, l, o, t, y, z


Input: Consider Input: ['7535', 'i', '4301', '4129', '1187', '4329', 'q', 'p', 'r', 'l', 'u', 'x', 'w', '4451', 'f', '8845', '7273', 'd', '3715', '6675', '4329', '2205', '679', 'g', 'b', 'c', '9375', '1995', 'l', 'y', 'x', '789', 'c', '4729', 'd', '6611']


Output: b, c, d, f, g, i, l, p, q, r, u, w, x, y