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.

['r', 't', '3539', 'z', 't', '6055', 'r', '5787', '8469', 'p', 'h', '9729', 'z', '1637', '5873', 'c', '3597', '4411', 's', 'k', 'q', '6471', '5375', 'e', 'v', 'i', '7425', 'h', '9079', 'd', '1585', '6011', 'x', '5669', '5219', '4951', '4765', '8285', '2811', 'c', '1805', '6463']
c, d, e, h, i, k, p, q, r, s, t, v, x, z

['135', 'u', '3435', '2985', '9811', 'y', '4309', '9757', '905', 'd', 'g', 'q', '1457', 'l', 'o', 'u', '4517', '2333', '3327', '577', 'a', '4041', '8101', '6211', 'f', 'j', '1721', '7217', 'q', '7443', '8477', '3117', '7779', '9339', '8615', 'm', 'c', 'f', 'c', '8979', '7895', 'k', 'w', '1619']
a, c, d, f, g, j, k, l, m, o, q, u, w, y

['9249', '7871', '1329', '7825', 'b', 'a', '4015', 'h', 'j', '67', 'p', '7719', 'z', 'p', '7413', 'd', '6555', '5625', 'a', '501', 'z', 'f', 't', 'b', '5965', 'e', 'c', 'z', '1955', 'l', '85', 'p', 'r', '6447', 's', '1091', 'd', 'y', 's', 'n', '3361', 'f', 'r']

a, b, c, d, e, f, h, j, l, n, p, r, s, t, y, z