#include<stdio.h>
int main()
{
	int a, b, c, t;

	scanf("%d%d%d", &a, &b, &c);

	
	if (b >=c&&c>=a)
	{
		t = a; a = b; b = t;
		
	}
	if (c >=b&&b>=a )
	{
		t = a; a = c; c = t;
		
	}
	
	if (c + b > a)

	{

		if (a*a == b * b + c * c)

			printf("Right triangle\n");

		if (a*a > b * b + c * c)
			printf("Obtuse triangle\n");
		if (a*a < b * b + c * c)
			printf("Acute triangle\n");
		if (b == c||b==a||a==c)
		{
			printf("Isosceles triangle\n");
			if (b==c&&b== a)
				printf("Equilateral triangle");
		}
	}
	else

			printf("Not triangle");
	
}