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: ['d', '4377', '9271', '8053', '9519']

A: d
****
Q: ['p', '5229', '7521', 'y', 'n', 'u', 'c', '4047', '781', 'a', '4707', '7149', 'j', 'm', 't', '515', '7691', 'h', '4879', 'j', '6593', 'n', 'p', '2949', '1343', 'y', '2629', 'p', 'b', 'b', '2861', 'a']

A: a, b, c, h, j, m, n, p, t, u, y
****
Q: ['w', 'f', 'n', 'j', 'q', 'e', '4879', '9419', 'y', '5259', '5581', 'c', '2705', 'l', '31', '6011', '4003', 't', 'q', '9091', '6757', 'o', '5409', '4171', 'd', 'v', '8445', '775', 's', '6529', '8895', '3447', 's', 'z', '9745', '4113', 'k', 'r', '2229', 's', '2995', '1393', 'i', 'l']

A:
c, d, e, f, i, j, k, l, n, o, q, r, s, t, v, w, y, z
****