Question: Who is the current mayor of the city located on the northern Great Plains that the Yellowstone River flow through? Passage 1:Donawa came through the youth setup at Somerset Trojans, playing in the Player Development League and the U-14 KO Cup. He made his senior debut for Somerset on 2 January 2014, appearing off the bench in the Friendship Trophy final as the Trojans claimed a 3–2 victory against Hamilton Parish. He continued to appear for Somerset for four more seasons, albeit infrequently as he could only play for the club while on breaks from school. Donawa returned to Somerset during the 2014–15 season, playing against Robin Hood in the Friendship Trophy and helping the club to claim their first Bermudian Premier Division title in 22 years. He was unable to appear in the title-deciding victory over Southampton Rangers, however, after suffering a sprained ankle while on international duty. Donawa helped the club to another championship in 2015–16, appearing in the Friendship Trophy while on holiday from school. He scored the final goal of a 3–0 victory against Hamilton Parish in the semifinals, giving Somerset the chance to win their eleventh Friendship Trophy after the new year. Against PHC Zebras in the final, Donawa scored the winning goal just before halftime as the Trojans claimed a 2–1 victory. On 12 December 2016, Donawa scored his first career Bermudian Premier League goal. His eighth-minute strike, off an assist from Hubert Buttersfield, helped Somerset claim a 2–2 draw against Devonshire Cougars. His second league goal had to wait until the 2017–18 season, coming in a 3–1 victory over X-Roads Warriors on 11 December 2017. He also added a goal in the semi-finals of the Expansion League Festive Tournament later that month and played the full 90 minutes in a 3–3 draw with North Village Rams on 17 March that clinched Premier Division safety for Somerset. The match against North Village would mark Donawa's final game with the club, as he was unable to participate during the 2018–19 season due to injury and a lack of international clearance.
 Passage 2:A halfback, Marhefka spent four seasons, 1920 through 1924, on Lafayette's football team under coach Jock Sutherland. In 1921 the squad went undefeated, but the college's president refused to allow them to compete in the Rose Bowl. After graduation, he was picked up by the Pottsville Maroons and played with them during their sole season in the Anthracite League, in which they were the champions. He remained with the team when they joined the National Football League the following year and was with them when, despite having the best record in the league, they were denied the 1925 NFL championship after being controversially suspended. He had a final season in professional football with the 1926 Philadelphia Quakers of the first American Football League, in which they were the champions. Marhekfa appeared in two games for the team during the season.
 Passage 3:The river rises in northwestern Wyoming in the Absaroka Range, on the Continental Divide in southwestern Park County. The river starts where the North Fork and the South Fork of the Yellowstone River converge. The North Fork, the larger of the two forks, flows from Younts Peak. The South Fork flows from the southern slopes of Thorofare Mountain. The Yellowstone River flows northward through Yellowstone National Park, feeding and draining Yellowstone Lake, then dropping over the Upper and Lower Yellowstone Falls at the head of the Grand Canyon of the Yellowstone within the confines of the park. After passing through the Black Canyon of the Yellowstone downstream of the Grand Canyon, the river flows northward into Montana between the northern Absaroka Range and the Gallatin Range in Paradise Valley. The river emerges from the mountains near the town of Livingston, where it turns eastward and northeastward, flowing across the northern Great Plains past the city of Billings.

Output: 3