Given a text passage, come up with an appropriate title for it. The title should accurately represent what the main focus of the passage is. The title of a passage may be present in the first few sentences of the passage and/or be referred to multiple times in the passage. The title should be 1-5 words long.

Ex Input:
'' Tropical '' refers to the geographical origin of these systems , which form almost exclusively over tropical seas . '' Cyclone '' refers to their winds moving in a circle , whirling round their central clear eye , with their winds blowing counterclockwise in the Northern Hemisphere and blowing clockwise in the Southern Hemisphere . The opposite direction of circulation is due to the Coriolis effect . Tropical cyclones typically form over large bodies of relatively warm water . They derive their energy through the evaporation of water from the ocean surface , which ultimately recondenses into clouds and rain when moist air rises and cools to saturation . This energy source differs from that of mid-latitude cyclonic storms , such as nor'easters and European windstorms , which are fueled primarily by horizontal temperature contrasts . Tropical cyclones are typically between 100 and 2,000 km ( 62 and 1,243 mi ) in diameter .

Ex Output:
Tropical cyclone

Ex Input:
The James R. Thompson Center ( JRTC ) is located at 100 W. Randolph Street in the Loop district of Chicago and houses offices of the Illinois state government .

Ex Output:
James R. Thompson Center

Ex Input:
Ottawa ( / tw / ( listen ) , / - w / ; French pronunciation : ( tawa ) ) is the capital city of Canada . It stands on the south bank of the Ottawa River in the eastern portion of southern Ontario . Ottawa borders Gatineau , Quebec ; the two form the core of the Ottawa -- Gatineau census metropolitan area ( CMA ) and the National Capital Region ( NCR ) . As of 2016 , Ottawa had a city population of 964,743 and a metropolitan population of 1,323,783 making it the fourth - largest city and the fifth - largest CMA in Canada .

Ex Output:
Ottawa