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