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.

Q: ['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']

A: b, c, d, e, i, o, p, q, r, u, w, y
****
Q: ['3223', 'h', 'w', 'f', 'y', '1667', '8843', '8759', '9203', '3305', '3549', '5507', '6251', 't', '8319', '9121', '6643', 'u', '4273', '4429', '7543', '7909', '789', '9183', '5729', 'd', '7063', 'b', '6677', 'w', 'x', 'x', 'z', '769', 'p', 'd', 'h']

A: b, d, f, h, p, t, u, w, x, y, z
****
Q: ['b', '8709', 'y', '675', 'd', 'g', '485', '65', '4311', '3007', '9253', 'v', '8731', '7427', '6965', 'c', 'n', '1361', 'k', '4301', 'p', '3043', 's', '717', 'i', 'l', '8517', 'v', 'x', 'e', '9393', 'y', '113', '2293', 'g', 'p', '6615', 'h', '991', 'd', 'g', '3667', 'm', 'l']

A:
b, c, d, e, g, h, i, k, l, m, n, p, s, v, x, y
****