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:
norio yoshimizu (吉水 法生, yoshimizu norio, born august 21, 1946) is a former japanese football player.

Ex Output:
norio yoshimizu


Ex Input:
the sun belt conference is a group of college sports teams that play each other on the ncaa division i level.

Ex Output:
sun belt conference


Ex Input:
guido altarelli (july 12, 1941 - september 30, 2015) was an italian theoretical physicist.

Ex Output:

guido altarelli