Question: Who was the head coach of the team that lost Super Bowl XIX?

full_context: Document 1: List of San Francisco 49ers seasons: This article is a list of seasons completed by the San Francisco 49ers, an American football franchise representing the San Francisco Bay Area. The 49ers are members of the West division in the National Football Conference (NFC) of the National Football League (NFL). The list documents the season-by-season records of the 49ers' franchise from to present, including postseason records, and league awards for individual players or head coaches. The San Francisco 49ers began play in 1946 as charter members of the All-America Football Conference.
Document 2: 2008 Miami Dolphins season: The 2008 Miami Dolphins season was the organization's 39th season in the National Football League and 43rd overall. During the regular season the Dolphins completed the greatest single-season turnaround in NFL history, going from a 1–15 regular season record in 2007 to an 11–5 record in 2008. The previous record for most improved team one year after a 1–15 season belonged to the 1992 Indianapolis Colts, who went 9–7. The 1999 Indianapolis Colts were the only other team to accomplish a 10-game turnaround, winning 13 games after winning 3 in 1998. Additionally, Miami won the AFC East, becoming the first team in NFL history to win their division after only having one win the previous season.
Document 3: Super Bowl XVI: Super Bowl XVI was an American football game between the National Football Conference (NFC) champion San Francisco 49ers and the American Football Conference (AFC) champion Cincinnati Bengals to decide the National Football League (NFL) champion for the 1981 season. The 49ers defeated the Bengals by the score of 26–21 to win their first Super Bowl.
Document 4: 2015 Miami Dolphins season: The 2015 Miami Dolphins season was the franchise's 46th season in the National Football League and the 50th overall. The Dolphins look to improve on their 8-8 record from 2014 and return to the playoffs for the first time in seven seasons. However Miami failed to clinch a playoff berth for the seventh consecutive season after a Week 14 loss to the Giants.
Document 5: 1978 Miami Dolphins season: The 1978 Miami Dolphins season saw the team return to the NFL playoffs for the first time since 1974, with an 11–5 record. Quarterback Bob Griese missed the first seven games due to a knee injury. The Dolphins got off to a 5-2 start behind back-up Don Strock. Upon Griese's return the Dolphins earned a birth to the playoffs as a Wild Card. Helping to lead the Dolphins back to the postseason was Running Back Delvin Williams who set a team record with 1,258 yards rushing on the season. In the first playoff game involving two Wild Cards the Dolphins were stunned 17-9 by the Houston Oilers at the Orange Bowl. In the process the Dolphins set two notable records: scoring first in all but one of their sixteen regular season games, and never trailing at any point in eleven games. The former record was equalled by the 2004 Patriots, and the latter was beaten by the 2005 Colts.
Document 6: Candlestick Park: Candlestick Park was an outdoor sports and entertainment stadium in the West Coast of the United States, located in San Francisco, California, in the Bayview Heights area. The stadium was originally the home of Major League Baseball's San Francisco Giants, who played there from 1960 until moving into Pacific Bell Park (since renamed AT&T Park) in 2000. It was also the home field of the San Francisco 49ers of the National Football League from 1971 through 2013. The 49ers moved to Levi's Stadium in Santa Clara for the 2014 season.
Document 7: Super Bowl XVIII: Super Bowl XVIII was an American football game between the National Football Conference (NFC) champion Washington Redskins and the American Football Conference (AFC) champion Los Angeles Raiders to decide the National Football League (NFL) champion for the 1983 season. The Raiders defeated the Redskins by the score of 38–9. The Raiders, coached by Tom Flores,' 38 points and their 29-point margin of victory broke Super Bowl records; it still remains the most points scored by an AFC team in a Super Bowl. The game was played on January 22, 1984, at Tampa Stadium in Tampa, Florida, the first time the Super Bowl was held in that city. This would be the AFC's last Super Bowl win until Super Bowl XXXII, won by the Denver Broncos.
Document 8: 1982 Miami Dolphins season: The 1982 Miami Dolphins season was the team's seventeenth in the National Football League. The team was coming off an unexpected 11-4-1 1981 season and a devastating loss to the San Diego Chargers in the Divisional Round the previous season in a game dubbed the Epic in Miami. The Dolphins had clinched the 2 seed and were picked by many to reach the Super Bowl during the 1981 season. Because of the high number of picks to reach the Super Bowl the previous season, many more fans picked them to win it during the 1982 season. The Dolphins looked to improve on their 11-4-1 record from 1981. However, a players strike cancelled 7 of the team's 16 games. Because of this, the NFL schedule was shrunk to 9 games. The Dolphins started out fresh, winning their first 2 games prior to the strike. When season play resumed 2 months later, the Dolphins defeated the Buffalo Bills 9-7 in Buffalo to clinch a 3-0 start. After a loss to Tampa Bay, they defeated the Minnesota Vikings 22-14. The next week, they lost a brisk game against the Patriots 3-0 in a game called the Snowplow Game. The Dolphins would then win 3 straight games to end the season 7-2, tied for 2nd in the AFC with the Cincinnati Bengals. The Dolphins won 2nd place over them by virtue of a series of tiebreakers. In the playoffs, they defeated the Patriots in a rematch by the score of 28-13. They then defeated the Chargers in a rematch of the 1981 Divisional Playoffs by a score of 34-13. In the AFC Championship game, they shutout the Jets, 14-0 to reach the Super Bowl for the first time since 1973. In Super Bowl XVII, they lost to the Redskins 27-17 in a rematch of Super Bowl VII which concluded Miami's perfect 1972 season.
Document 9: 1983 Miami Dolphins season: The 1983 season was the 18th season in football for the Miami Dolphins and they sought to return to the Super Bowl after losing to the Washington Redskins in Super Bowl XVII. It was also a turning point in the team's history, as in the 1983 NFL Draft a young quarterback slipped to deep in the opening round, being passed over by such teams as division rivals New York who drafted Ken O'Brien and New England who drafted Tony Eason. With the 27th pick, the Dolphins decided to take a chance on Dan Marino. In the draft's eighth round the Dolphins also selected receiver Mark Clayton.
Document 10: Super Bowl XVII: Super Bowl XVII was an American football game between the American Football Conference (AFC) champion Miami Dolphins and the National Football Conference (NFC) champion Washington Redskins to decide the National Football League (NFL) champion for the 1982 season. The Redskins defeated the Dolphins by the score of 27–17 to win their first Super Bowl championship. The game was played on January 30, 1983 at the Rose Bowl in Pasadena, California.
Document 11: Super Bowl XIX: Super Bowl XIX was an American football game between the American Football Conference (AFC) champion Miami Dolphins and the National Football Conference (NFC) champion San Francisco 49ers to decide the National Football League (NFL) champion for the 1984 season. The 49ers defeated the Dolphins by the score of 38–16, to win their second Super Bowl. The game was played on January 20, 1985, at Stanford Stadium, on the campus of Stanford University in Stanford, California, a suburb of Silicon Valley within the San Francisco Bay Area.
Document 12: San Francisco 49ers: The San Francisco 49ers are a professional American football team located in the San Francisco Bay Area. They compete in the National Football League (NFL) as a member of the league's National Football Conference (NFC) West division. The team currently plays its home games at Levi's Stadium in Santa Clara, California, located 45 mi southeast of San Francisco in the heart of Silicon Valley. Since 1988, the 49ers have been headquartered in Santa Clara.
Document 13: 1970 Miami Dolphins season: The 1970 Miami Dolphins season was the team's fifth, and first in the National Football League (NFL). The 1970 season marked the team's first winning season, and their first playoff appearance. The 1970 season was also the first season under head coach Don Shula, as he would be the head coach of the franchise until 1995, a span of 25 years as head coach. The team improved on their 3-10-1 record from 1969, and finished the season 10-4, second in the newly aligned AFC East to only eventual champion Baltimore. The Dolphins would get off to a fresh start, starting 4-1 before losing 3 straight to even their record at 4-4. However, Miami would whip off 6 straight to end the season and clinch their first ever winning season and playoff berth. In their first playoff game, they lost 21-14 in the Divisional Round to the Oakland Raiders, ending Miami's season.
Document 14: 1984 Miami Dolphins season: The 1984 Miami Dolphins season was the team's 19th season, and 15th in the National Football League. It was also the 15th season with the team for head coach Don Shula. The Dolphins sought to build on a spectacular 1983 season where they went 12–4 with rookie quarterback Dan Marino, only to be upended by the Seattle Seahawks in the playoffs.
Document 15: 1984 Denver Broncos season: The 1984 Denver Broncos season was the team's 25th year in professional football and its 15th with the National Football League (NFL). The team finished with its then franchise best record of thirteen wins and three losses and were champions of the AFC West. The season ended in a heartbreaking Divisional Playoff loss against the Pittsburgh Steelers. This would be the final season for Tight End coach Fran Polsfoot, who died in April 1985.
ground_truth: Don Shula