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.

Input: Consider Input: ['o', '369', 'z', '5721', 'w', 'v', '4973', '7773', 'k', '3071', '5103', '425', '4239', '7977', 'n', 'i', 'k', '8117', '9843', 'n', 'd', '1353', 'h', 'd', 'v', 'z', 'j', '8727', '6997', 'x', '767', '4331', 't']

Output: d, h, i, j, k, n, o, t, v, w, x, z


Input: Consider Input: ['t', 'h', '6141', 'g', 'f', 'z', 'n', 'b', 'k', '9059', 'y', 'p', '4289', '2683', 'a', '3267', 'w', 'p', 't', '3623', '7759', 'a', 'o', 'm', '9815', 'q', 'u', '8051', '6871']

Output: a, b, f, g, h, k, m, n, o, p, q, t, u, w, y, z


Input: Consider Input: ['r', 'p', '3975', 'q', '9835', '383', 'u', '7387', '7355', '1559', 'g', '1039', '3137', 'r', '217', 'c']


Output: c, g, p, q, r, u