in the Five School Competition, where the students solve various problems in maths, chemistry and physics. The Swedish students have been hosted by the Estonian students at their homes. The Estonian students usually go to Sweden, as well. There they are shown the cities of Stockholm and Uppsala and they also take part in a friendly competition, where the teams consist of a mix of students from Estonia and Sweden. Friendship with the Isokyrö School in Finland The friendship with the Isokyrö School is mainly based on the choir and folk dancing groups of Hugo Treffner Gymnasium. The Isokyrö School is mainly an arts school. Both schools have sent their students to visit the others. When the Estonian students went to Finland, they mainly gave concerts and showed their dancing skills. When the Finnish students came to visit Tartu, they made some art. This particular friendship was initiated around 1994 and the last visits took place in 2007. Friendship with the Riga National Gymnasium in Latvia The friendship with the Riga National Gymnasium started in 2007, when the trip to Isokyrö was cancelled. As the leaders of the choir and folk dancing groups were looking for a new destination, the Latvian school contacted Hugo Treffner Gymnasium with the wish to initiate a friendship. Much like the trip to Isokyrö , the representatives of Hugo Treffner Gymnasium were mainly teachers, singers and dancers. The Estonian students have been to Riga twice, but the second time in 2012, only the choir group was sent. The Latvian students have been to Tartu only once, but they plan to come and visit Hugo Treffner Gymnasium once again in 2014. Notable alumni Adamson-Eric (1902–1968), artist Artur Alliksaar (1923–1966), poet Paul Alvre (1921–2008), linguist Efraim Allsalu (1929–2006), painter Kaur Alttoa (born 1947), art and cultural historian Karl Ast (1886–1971), writer and politician Kaarel Eenpalu (1888–1942), politician and journalist Jaan Einasto (born 1929), astrophysicist Ernst Enno (1875–1934), poet and writer Ivar Grünthal (1924–1996), writer Edgar Hark (1908-1986), Lutheran bishop Jüri Jaakson (1870–1942), politician and businessman Mihkel Järveoja (born 1986), orienteer Ottniell Jürissaar (1924–2014), poet, composer, and conductor Ain Kaalep (born 1926), writer and poet Karl Kalkun (1927–1990), actor Jaan Kaplinski (1941–2021), writer and translator August Kastra (1878–1941), journalist and a trade union leader Harald-Paul Keerdo (1891–1950), communist politician Johan Kõpp (1874–1970), Lutheran bishop Kaimo Kuusk (born 1975), diplomat and foreign intelligence officer Oudekki Loone (born 1979), politician