#include<stdio.h>
int main ()
{
  int  a,b,c,t;
  scanf("%d%d%d",&a,&b,&c);   
  if(a>c)
 {
  t=a;
    a=b;
  b=t;
 }
 if(b>c)
 {
 t=b;
 b=c;
 c=t;
}
  if(a+b>c&&a+c>b&&b+c>a)
   {
    if(a*a+b*b==c*c||b*b+c*c==a*a||a*a+c*c==b*b)
     printf("Right triangle\n");
    if(a*a+b*b>c*c)
     printf("Acute triangle\n");
    if(a*a+b*b<c*c)
     printf("Obtuse triangle\n");
    if(a==b||b==c||a==c)
     printf("Isosceles triangle\n");
    if(a==b==c)
     printf("Equilateral triangle\n");
   }
  else
  {
   printf("Not triangle");
   }
   return 0; 
   
}