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: ['v', '5433', 'v', '6749', '7491', 'i', 'm', 'e', '5815', '8423', '833', '7359', 'm', 'i', 'f', 'u', 'p', 'j', 't', '3171', '6165', 'q', 'a', '9475', 'm', 'q', '5995', '8443']

Output: a, e, f, i, j, m, p, q, t, u, v


Input: Consider Input: ['j', 'y', '9907', 'a', '5715', 'l', '9817', '1949', '2697', '2255', '9571', '8957', '9329', '6055', 'z', 'q', '1185', '4593']

Output: a, j, l, q, y, z


Input: Consider Input: ['6367', 'l', '4369', '571', '3689', 'l', 't', '8797', '2365', '6287', 'c', 'g', '423', 'z', 'k', '3489', 'a', '323', '9257', 'q', '4483', '5133', '2163', '5347', '1209', 'g', '3519', 'v', '3335', '859', 'k', 'r', '1515', 'o', 'd', 'a', '1965', '1025', 's', 'w', '4303', '8679', '2347', 'x', 'b']


Output: a, b, c, d, g, k, l, o, q, r, s, t, v, w, x, z