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: ['e', '2239', 'l', '8309', 'i', '2613', 'i', '611', '6481', 'j', 'v', '1867', '415', '269', '8053', '3369', 'q', 't', '2303', '7729', '1059', '6135', '3299', 'd', '6855', '207', '6227', '7859']

A: d, e, i, j, l, q, t, v
****
Q: ['1345', 'y', '7221', 'h', 'r', '3255', 'k', 'r', 'j', '8639', '467', 'f', 'k', 'n', 'k', 'j', 'l', 'w', '143', 'w', 'q', '5657', '589']

A: f, h, j, k, l, n, q, r, w, y
****
Q: ['l', 'i', '1321', '4289', 'x', '3251', 'i', '9187', 'h', '655', '3077', '1277', 'b', 'z', 'm', 'v', '5455', '1051', 'v', 'p', '1831', '1609', 'i', 'c', 'x', '9495', 'w', '645', 'n', 'u', '6175', 'g']

A:
b, c, g, h, i, l, m, n, p, u, v, w, x, z
****