who were all of the finnish presidents?
k. j. stahlberg, lauri kristian relander, p. e. svinhufvud, kyosti kallio, risto ryti, gustaf mannerheim, j. k. paasikivi, urho kekkonen, mauno koivisto, martti ahtisaari, tarja halonen, sauli niinisto
how long did each president serve?
5 years, 220 days, 6 years, 0 days one leap year (1928), 5 years, 364 days two leap years (1932 and 1936), 3 years, 293 days, 3 years, 229 days, 1 year, 219 days, 9 years, 356 days, 25 years, 332 days, 12 years, 33 days, 6 years, 0 days two leap years (1996 and 2000), 12 years, 0 days, 2 years, 115 days
between martti ahtisaari	and mauno koivisto, which served the longest?
mauno koivisto