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: ['v', '5433', 'v', '6749', '7491', 'i', 'm', 'e', '5815', '8423', '833', '7359', 'm', 'i', 'f', 'u', 'p', 'j', 't', '3171', '6165', 'q', 'a', '9475', 'm', 'q', '5995', '8443']

A: a, e, f, i, j, m, p, q, t, u, v
****
Q: ['315', '9975', '3013', 's', '6131', 'e', 'e', 'u', 'a', '1729', 'g', 't', 'y', 'f', '7523', 'e', 'g', '489', 'm', 'p', 'f', 'e', '2077', 'e', 'g', 'c', 'l', '6389', 'k', 'b']

A: a, b, c, e, f, g, k, l, m, p, s, t, u, y
****
Q: ['3431', 'i', 'c', '7975', '7199', '3057', 'z', 'm', '3881', 'm', '2295', '2851', 'z', '7335', '751', '5525', 'a', 'f', '5955', 'f', '1599', 'y', 'k', 'j', 'u', '6433', '7553', 's', 'o', 'e', '7313', '2885', '7491', 'k', '7079']

A:
a, c, e, f, i, j, k, m, o, s, u, y, z
****