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.

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

['587', '3903', 'z', 'l', 'k', '5693', 'x', '1695', 'c', '3185', 'g', '9491', '8185', '1285', '2533', '6825', '3187', '6039', 'e', '251', 'w', '7741', '9573']
c, e, g, k, l, w, x, z

['n', 'h', 'k', '1453', 'f', '3641', 'l', '3445', 'e', 'h', '5679', '477', '51', 'a', '4465', '235', '975', 'a', 'j', 'o', 'f', 'j', 'b', '5415', 'z', 'p', '6985', 't', 'q', '1755', '7377', '2467', '5669', '3055', '6679', '3571', '3647', '635', '5387', '7991', '5711', '4297']

a, b, e, f, h, j, k, l, n, o, p, q, t, z