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