#include <stdio.h>

int a,b,c,naj,dru,tre;

int main(){
    
    scanf("%d %d %d ",&a,&b,&c);
    
    while (a){
          
          if ((a>=b)&&(a>=c)){
                            naj=a;
                            if (b>=c){dru=b; tre=c;}
                            else {dru=c; tre=b;}
                            }
                            
          if ((b>=a)&&(b>=c)){
                            naj=b;
                            if (a>=c){dru=a; tre=c;}
                            else {dru=c; tre=a;}
                            }

          if ((c>=b)&&(c>=a)){
                            naj=c;
                            if (a>=b){dru=a; tre=b;}
                            else {dru=b; tre=a;}
                            }
                            
           int done=0;
                               
           if (dru+tre<=naj){printf("none\n"); done=1;}                 
           
           
           if (!done) {if (dru*dru+tre*tre==naj*naj){printf("right\n"); done=1;}                 }
           
           if (!done) {           if (dru*dru+tre*tre>naj*naj){printf("acute\n"); done=1;}                            }
           
           if (!done) {           if (dru*dru+tre*tre<naj*naj){printf("obtuse\n"); done=1;}                             }          
           
          
          
          
    scanf("%d %d %d ",&a,&b,&c);          
          }
    
 return 0;   
}