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.

['459', '1729', 'b', 'c', '9619', '4461', '4347', '6733', 'i', '3631', 's', 'j', 'i', 'r', '5293', 'q', '7397', '4309', 'c', 'n', 'k', '197', 'q', '8139']
b, c, i, j, k, n, q, r, s

['2459', '3709', 'f', '8673', '9313', 'm', 'd', 'g', 'c', 'g', 'u', 'f', 'p', 'i', '8771', '3613', '9669', '6221', '1211', '8331', '2295', 'b', 'f', 'm', '1377', '9831', '1751', 'k', '4831', 'm', '2747', '3435', '4543', 'c', '1729', 'e', '7093', '397', 'm', '383', '2019']
b, c, d, e, f, g, i, k, m, p, u

['v', '5433', '6405', '7131', '8275', '2635', '5201', '4101', 'o', 'i', 'j', '5629', 'e', '5283', '8219', 'u', 'u', '5047', '5995', '2209', 'z', 'a', '6353', 'e', 'u', 'z', 'v', 'g', 'b', '9267', '7947', 'q', 'f', '3149', '5613', 'd', 'h', 'm', '8577', '2943']

a, b, d, e, f, g, h, i, j, m, o, q, u, v, z