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.
--------
Question: ['e', '2239', 'l', '8309', 'i', '2613', 'i', '611', '6481', 'j', 'v', '1867', '415', '269', '8053', '3369', 'q', 't', '2303', '7729', '1059', '6135', '3299', 'd', '6855', '207', '6227', '7859']

Answer: d, e, i, j, l, q, t, v


Question: ['d', '771', '4193', 'e', '1537', 'a', 'q']

Answer: a, d, e, q


Question: ['j', '4667', 'b', '9509', 'l', 'r', '9977', '9685', '9705', 'f', 'o', 'm', 'd', '8811', '8161', 'g', 'd', 'c', 'f', '437', 'h', '8315']

Answer:
b, c, d, f, g, h, j, l, m, o, r