Question: What number season was the Brazillian central defender signed, who was previously a left back?

full_context: Document 1: Daniel Van Buyten: Daniel Van Buyten (] ; born 7 February 1978) is a Belgian former footballer who played as a centre back. Nicknamed "Big Dan", Van Buyten was known for his uncompromising style of play, exploiting both his physical strength and aerial ability.
Document 2: Neymar: Neymar da Silva Santos Júnior (] ; born 5 February 1992), commonly known as Neymar or Neymar Jr., is a Brazilian professional footballer who plays as a forward for French club Paris Saint-Germain and the Brazil national team.
Document 3: 2010 DFB-Pokal Final: The 2009–10 DFB-Pokal season came to a close on 15 May 2010 when Bayern Munich played defending champions Werder Bremen at the Olympiastadion in Berlin. Bayern thrashed Bremen 4-0 with goals from Robben, Olić, Ribéry, and Schweinsteiger. The title capped off a successful season, with Bayern winning the domestic double of the Fußball-Bundesliga and the DFB-Pokal. These successes were Bayern's 22nd league and 15th cup titles. Bayern were also in line for "The Treble" but lost to Internazionale of Milan, 2-0 in the Champions League Final at Madrid's Santiago Bernabéu Stadium on 22 May.
Document 4: 2007–08 FC Bayern Munich season: Prior to the beginning of the 2007–08 season, Bayern Munich underwent a major restructuring of the team, releasing or retiring nine players while adding ten others to the squad, most notably Luca Toni and Franck Ribéry. The season started with Bayern winning the DFB-Ligapokal, followed by a shootout win in the DFB-Pokal against Wacker Burghausen on 6 August 2007. On the first day of the 2007–08 Bundesliga season, Bayern achieved a 3–0 victory over Hansa Rostock. As the season progressed, Bayern continued in first in the league table, eventually winning the championship. Bayern also won the 2007–08 DFB-Pokal, thereby completing the double. International success was thwarted by Zenit Saint Petersburg, however, when Bayern suffered a 4–0 defeat in the second leg of the semi-final after a draw at home. The 2007–08 season was goalkeeper Oliver Kahn's last season with Bayern.
Document 5: 2012–13 FC Bayern Munich season: The 2012–13 FC Bayern Munich season was the 114th season in the club's history and the 48th consecutive season in the top flight of German football, the Bundesliga, since the promotion of the team from the Regionalliga Süd in 1965. Before the start of the season, Bayern signed Xherdan Shaqiri, Dante, Claudio Pizarro, Mitchell Weiser, Tom Starke and Mario Mandžukić. Bayern also added holding midfielder Javi Martínez after the first week of the Bundesliga season at the transfer deadline. The club started the season with a nine-match winning streak. The club would end the season claiming the Treble, winning the Bundesliga, the UEFA Champions League and the DFB-Pokal. Bayern are the first German club to achieve the Treble and are the third European Club to complete the Treble in the last five seasons and seventh ever in European Club competition.
Document 6: 2002–03 Olympique de Marseille season: Olympique de Marseille almost won the French League for the first time in 11 years, having a remarkable run to third place, having only scored five goals more than it conceded. The most praised player was central defender Daniel Van Buyten, who was able to tighten up the defence, and also helping out with scoring several important goals. Without Marseille's goalscoring woes, it could have sustained a more serious title assault. Therefore it signed late-blooming starlet Didier Drogba from En Avant Guingamp, a move that was set to be among the best financial deals in the clubs' history.
Document 7: Dante (footballer): Dante Bonfim Costa Santos (born 18 October 1983), commonly known as Dante (] ), is a Brazilian professional footballer who plays for French Ligue 1 club Nice. Primarily a central defender, he has previously also been used as a defensive midfielder or a left back.
Document 8: Diego Costa: Diego da Silva Costa (] , ] ; born 7 October 1988), is a professional footballer who plays as a striker for Premier League club Chelsea and the Spain national team. He has been described by pundits as a talented striker whose main attributes are his physicality, goalscoring and ability to keep possession. Costa has been criticised and punished for several confrontations with opponents.
Document 9: N'Golo Kanté: N'Golo Kanté (] ; born 29 March 1991) is a French professional footballer who plays as a defensive midfielder for English club Chelsea and the France national team.
Document 10: 2013–14 FC Bayern Munich season: The 2013–14 FC Bayern Munich season is the 115th season in the club's history and the 49th consecutive season in the top flight of German football, the Bundesliga, since their promotion from the Regionalliga Süd in 1965. Bayern will also participate in this season's editions of the DFB-Pokal, DFL-Supercup, UEFA Champions League, UEFA Super Cup, and FIFA Club World Cup.
Document 11: 2014–15 FC Barcelona season: The 2014–15 season was Futbol Club Barcelona's 115th in existence and the club's 84th consecutive season in the top flight of Spanish football. It was one of the most successful seasons in the club's history as they clinched the Treble by winning La Liga, Copa del Rey and the UEFA Champions League. By doing so, the Catalans became the first European team to twice win the domestic double as well as the highest continental tournament, after winning their first treble in the 2008–09 season. Barcelona's success was due to a large extent to their formidable forward trio composed of Lionel Messi, Neymar and summer signing Luis Suárez, who scored an unprecedented total of 122 goals in all competitions to become the trio with most goals in Spanish football history.
Document 12: 2016–17 FC Bayern Munich season: The 2016–17 FC Bayern Munich season was the 118th season in the football club's history and 52nd consecutive and overall season in the top flight of German football, the Bundesliga, having won promotion from the Regionalliga in 1965 after winning the Regionalliga Süd. Bayern Munich also participated in this season's edition of the domestic cup, the DFB-Pokal, and the premier continental cup competition, the UEFA Champions League. Bayern were the reigning Bundesliga and DFB-Pokal champions, and therefore also participated in the German super cup, the DFL-Supercup. It was the 12th season for Bayern in the Allianz Arena, located in Munich, Germany. The season covers a period from 11 July 2016 to 30 June 2017.
Document 13: 2014–15 FC Bayern Munich season: The 2014–15 FC Bayern Munich season was the 116th season in the club's history and the 50th consecutive season in the top flight of German football, the Bundesliga, since their promotion from the Regionalliga Süd in 1965. Bayern participated in the season's editions of the DFB-Pokal, DFL-Supercup and UEFA Champions League. It was the 10th season for Bayern in the Allianz Arena.
Document 14: Dunga: Carlos Caetano Bledorn Verri (born 31 October 1963 in Ijuí, Rio Grande do Sul), commonly known as Dunga (] ), is a Brazilian football manager and former professional footballer of Italian and German descent, who played as a defensive midfielder. Under Dunga's captaincy, Brazil won the 1994 FIFA World Cup. Along with Xavi, he is one of only two men to have played in a World Cup, Olympic Games, Confederations Cup and continental championship final. He was head coach of Brazil twice. In his first spell from 2006 to 2010, he led them to victory in the 2007 Copa América and the 2009 FIFA Confederations Cup, and to the quarter-finals of the 2010 FIFA World Cup, after which he was dismissed by the Brazilian Football Confederation. He was appointed in 2014 for a second time, but Brazil's early exit from the Copa América Centenario led to his dismissal in June 2016. He was also head coach of Internacional in 2013.
Document 15: 2017–18 FC Bayern Munich season: The 2017–18 FC Bayern Munich season is the 118th season in the football club's history and 53rd consecutive and overall season in the top flight of German football, the Bundesliga, having been promoted from the Regionalliga in 1965. Bayern Munich also are participating in this season's edition of the domestic cup, the DFB-Pokal, and the premier continental cup competition, the UEFA Champions League. Bayern are the reigning Bundesliga champions, and therefore also are participating in the German super cup, the DFL-Supercup. This is the 13th season for Bayern in the Allianz Arena, located in Munich, Bavaria, Germany. The season covers a period from 1 July 2017 to 30 June 2018.
ground_truth: 114th