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