Generate a topic word for the given sentence. A topic word is usually the name of a person, place, animal, concept or object the sentence is focusing on.

Ex Input:
milwaukee is the largest city in the state of wisconsin.

Ex Output:
milwaukee

Ex Input:
goldenrods are any of the about 150 species of weedy herbs that make up the genus solidago.

Ex Output:
goldenrod

Ex Input:
dje, or djerv (, ) is the sixth letter of the serbian cyrillic alphabet, used in the serbian language to represent the sound for need to tell /d/, a palatalisation, similar to the english sound of letter "j" .

Ex Output:
dje