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: ['4905', 'w', '3143', '2217', '573', '1073', '63', 'a', '3971', '2887', '3485', 'y', '3893', '1059', '7623', 'x', 'd', '2991', 'e', 's', '735', 'm', 's', '257', 'x', '5559', '97', 'p', '7237', '693', '7229', 'd', '2311', '807', 'd', 'l', '1247', 'l', '359']

Output: a, d, e, l, m, p, s, w, x, y

Input: Consider Input: ['4299', 'b', '4171', '7639', '6609', '927', '5249', 'o', 'p', '9851', 'e', '1311', '3777', '7799', '7687', '8809', 'c', 'r', '47', '1925', '1847', 'r', 'd', 'r', '1871', '5935', 'r', '2283', 'p', 'p', '2727', 'c', 'i', '7357', 'y', '5103', '6115', 'q', 'w', 'u', '9201', '4221', '7717', 'o']

Output: b, c, d, e, i, o, p, q, r, u, w, y

Input: Consider Input: ['7233', 'a', '9867', 'c', 'u', '2339', '2211', '1373', '9693', 'i', 'x', 'v', '4767', 'w', 'z', 'h', '9175', '5565', 'b', 'f', '8667', '3919', '4785', 'l', '3449', '1909']
Output: a, b, c, f, h, i, l, u, v, w, x, z