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]: ['l', '1213', 'm', 'k', '7825', '3501', '2397', '2313', 'v', '4119', 'h', 't', '6137', 'l', '9851', 'q', '9661', 'b', 'z', '1437', '1759', 'l', '611', '5085', '4443', 'n', 'u', 'b', '2511', '6023', '7157', 'n', '9921', 'o', 'a', 'o', 'w', 't', 'o', '1607', '6751', 'n', 'b']
[A]: a, b, h, k, l, m, n, o, q, t, u, v, w, z


[Q]: ['9351', 'v', 'h', 'z', 'g', 'f', 't', 'q', 'g', 'o', '4073', 'n', '6149', '1735', '157', 'm']
[A]: f, g, h, m, n, o, q, t, v, z


[Q]: ['9669', 'j', 'g', '6405', '2551', '135', '1353', 'x', '8389', 'l', 't', '3293', '7995', 's', 's', 'q', '791', 'd', 'k', '7245', '6199']
[A]:
d, g, j, k, l, q, s, t, x