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: ['4371', '9499', 'e', 'w', '9969', '8367', '2897', '1745', 'i', '7049', '9773', 'h', '9649', 'u', '4673', '8513', '8547', 'z', '1995', '7739', '2215', '171', 'c', '7527', '2479', 't', '5223', 'p', '2313', '3243', '2281', 'r', 'c']

A: c, e, h, i, p, r, t, u, w, z
****
Q: ['p', '3981', 'e', '5949', 'p', '4075', '1919', 'w', 'r', '8059', '4303', 'f', '5201', '2255', '2737', '7395', '8809', 'j', 'z', 'n', '4797']

A: e, f, j, n, p, r, w, z
****
Q: ['3345', 'e', 'a', 'v', 'c', '6781', '4909', '2641', 'p', 'j', '115', '3253', '963', '7287', '5235', 'b', 'm', 'c', '4153', 'w', 'a', '6879', 'o', 'e']

A:
a, b, c, e, j, m, o, p, v, w
****