You will be given a definition of a task first, then some input of the task.
In this task, you're given a question, along with three passages, 1, 2, and 3. Your job is to determine which passage can be used to answer the question by searching for further information using terms from the passage. Indicate your choice as 1, 2, or 3.

Question: How many miles long is the river by which Charlie's isolated cabin was located? Passage 1:Charlie Biederman (November 11, 1918February 22, 1995) was a musher in Alaska best known for being the last surviving dog sled mail carrier in the United States. Charlie was born in Alaska as the son of Ed Biederman, a musher born in Bohemia who immigrated to the United States in 1874 and also delivered the mail via dog sled. The date of Charlie's birth is unclear, but contemporary U.S. Censuses indicate it likely was around 1919. Charlie had four siblings. Charlie was raised in Eagle, Alaska, but lived in an isolated cabin on the Yukon River for most of his life. From an early age, he assisted his father and brother in their winter deliveries of the mail to isolated cabins in central Alaska. In winter, the family lived in Eagle and ran the mail route between that town and Circle, another small settlement approximately downriver. In the summer, the family lived at their Yukon River cabin, harvesting fish for subsistence and boarding the dogs of fellow mushers. In 1938, the family were underbid for the main contract for mail delivery in the area by a bush pilot. Ed Biederman retired shortly afterward and died in 1945. The final dog sled mail route was replaced in 1963. That final route was from Gambell to Savoonga and was run by Chester Noongwook. In January 1995, he donated the mail-delivery sled he used to the National Postal Museum in Washington, D.C., where it hangs today. One month after making the delivery, he died on February 22, 1995.
 Passage 2:S. Krishnaswami, born on 21 May 1945 in Thiruvananthapuram, in the south Indian state of Kerala, did his graduate studies in science at the University College, Thiruvanathapuram of the University of Kerala and on completion of the degree in 1963, he joined Bhabha Atomic Research Centre Training School for a short term training. Subsequently, he joined the Geophysics group of Tata Institute of Fundamental Research as a research associate in 1964 where he stayed till 1972. Simultaneously, he enrolled at Bombay University and secured a PhD in 1974, working under the guidance of Devendra Lal. His post-doctoral researches were at Scripps Institution of Oceanography with Harmon Craig and at the laboratory of K. K. Turekian of Yale University. By this time, he had already moved to Physical Research Laboratory (PRL), Ahmedabad in 1973 and on returning to India, he spent the rest of his career there, superannuating from service in 2005. He held various positions during his tenure at PRL such as that of a Dean from 1987 to 1993 and Acting Director during 2004–05 and continued his association with the laboratory post-retirement as an INSA scientist and honorary professor. He also served as a visiting scientist at Scripps Institute of Oceanography (1971–72) and as a visiting faculty at the Department of Geology and Geophysics of Yale University for two stints during 1976–77 and 1986–87.
 Passage 3:In 1996, Smith began his coaching career as an assistant at Hempfield High School. From there Smith spent the next four seasons as the passing coordinator for the Duquesne Dukes. In 2001, Smith returned to his high school alma mater the Gateway Gators where he served as the offensive coordinator. The following season Smith was named as the Gators Head Coach and over the next eleven seasons Smith led Gateway to a 101-30 mark and four WPIAL runner-up finishes.. In that time Smith sent 23 players to NCAA FBS (I-A) colleges and 17 more to FCS(I-AA) colleges, and coached in three U.S. Army All-America and Semper Fidelis All-America games. He has mentored six NFL players, including former Nittany Lions Trevor Williams, Jordan Lucas, Justin King and Lydell Sargeant. Smith, who also served as the athletic director, departed Gateway following the 2012 football season when his athletic director position was reduced to part-time. His salary was also cut in half and the district instituted a new rule that no administrator could coach. Following a January recruiting visit in 2013, the Temple Owls coach and fellow Penn State alum Matt Rhule offered Smith a coaching position as his wide receivers coach. Smith accepted and helped the Owls’ passing game reach new heights during the 2013 season. In 2014 James Franklin hired Smith as the Penn State Nittany Lions’ defensive recruiting coordinator and cornerbacks coach, positions he currently maintains. Smith is also the assistant head coach for the Nittany Lions, a title received following the 2015 season.

Output:
1