Which president is on the us 50 dollar bill?

A portrait of Ulysses S. Grant, the 18th President of the United States, is on the front of the US $50 bill. If you look below the portrait, there's a small caption with his name. All U.S. bills have similar captions that identify both the person on the bill's front and the scene on the bill's back.

The United States Capitol bulding is on the back.