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: ['5859', 'x', 'z', 'v', 'l', 'z', 'g', 't', 'x', '341', '7023', '4937', 'b', 'n', 'y', 't', 's', '1369', '4461', 'f', '1315', 'l', '5221', '6583', 'h', 'j', 't']

A: b, f, g, h, j, l, n, s, t, v, x, y, z
****
Q: ['1063', 'f', 'm', 'i', 'x', 'i', 'd']

A: d, f, i, m, x
****
Q: ['3335', '8019', '509', '3813', 'b', 'r', '5039', 'r', '5859', 'l', '5507', 'f', '7249']

A:
b, f, l, r
****