instruction:
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:
['f', 'j', '9195', '3155', '2855', '5333', '5263', '9279', '687', 'e', '3055', '7233', '13', 'j', 'p', 'i', '8327', 'm', 'h', '3977', 'h', '7997', 'a', 'h', '4661', 'x', '8237', 'a', '5009', 'o', 'p', 'z', '2293', 'q', 'p', '5469', 'k', 'q', 'b', 'n', '1967', '4991']
answer:
a, b, e, f, h, i, j, k, m, n, o, p, q, x, z


question:
['9735', 'e', 'e', '6117', '7221', '1347', 'd', 'r', 'y', 'n', '579', '6707', 'm', 'q', '87', '7549', '6525', 'k', '2501', '9969', '6461', '8873', '9141', 'g', 'l']
answer:

d, e, g, k, l, m, n, q, r, y