#include<stdio.h>
int main()
{
	int a, b, c;
	scanf("%d%d%d", &a, &b, &c);
	int t = 0;
	if (a > b)
	{
		t = a;
		a = b;
		b = t;
	}
	if (b > c)
	{
		t = b;
		b = c;
		c = t;
	}
	if (a > b)
	{
		t = b;
		b = a;
		a = t;
	}//从小到大排序：a,b,c
	if (a + b < c || a + c<b || b + c<a)
	{
		printf("Not triangle");
	}
	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 || a == c || b == c)
		{
			printf("Isosceles triangle\n");
		}
		if (a == b && a == c && b == c)
		{
			printf("Equilateral triangle");
		}
	}
	return 0;
}