using C=System.Console;class M{static void Main(){var a=" hen do tri tetr pent hex hept oct non meth eth prop but un dec icos cos".Split(' ');for(int i;;C.Write(a[i<5|i==11?i%6+9:i%10]+(i>9&i%10>3?"a":"")+(i<30?a[i/10+i/22+15]:a[i/10]+"acont")+"ane\n"))i=int.Parse(C.ReadLine());}}
Note that non-ascii characters in the above source code will be escaped (such as \x9f).