#include<stdio.h>
#include<math.h>
int main()
{
	int a,b,c,t;
	scanf("%d%d%d",&a,&b,&c);
if(a>b){
	 	t=a;
	 	a=b;
	 	b=t;
	 }
	 if(a>c){
	 	t=a;
	 	a=c;
	 	c=t;
	 }
	 if(b>c){
	 	t=b;
	 	b=c;
	 	c=t;
	 }
	 if((a+b)<c)
	 printf("Not triangle\n");
	 if(a*a+b*b==c*c)
	 printf("Right triangle\n");
	 if(((a*a+b*b-c*c)/2*a*b)>0)
	printf("Acute triangle\n");
	if(((a*a+b*b-c*c)/2*a*b)<0)
	printf("Obtuse triangle\n");
	 if(a==b)
	 printf("Isosceles triangle\n");
	 if(a==b==c)
	printf("Equilateral triangle\n");
	return 0;
 }