#include<stdio.h>
void swap(int* x, int* y)
{
	int team = *x;
	*x = *y;
	*y = team;
}
int main()
{
	int a, b, c;
	scanf("%d %d %d", &a, &b, &c);
	if (a == b && b == c)
	{
		printf("Equilateral triangle");//等边三角形
	}
	else
	{
		if (a < b)swap(&a, &b);//a到b到c ，从大到小排序
		if (a <c)swap(&a, &c);
		if (b < c)swap(&b, &c);
		
		if (b + c <= a)
		{
			printf("Not triangle");//不构成三角形
		}
		else
		{
			if (a * a == b * b + c * c)
			{
				printf("Right triangle");//直角三角形
			}
			if (b == c)
			{
				printf("Isosceles triangle");//等腰三角形
			}
			if (a*a>(b*b+c*c))
			{
				printf("Obtuse triangle");//钝角三角形
			}
			if (a*a<(b*b+c*c))
			{
				printf("Acute triangle");//锐角三角形
			}
		}
		
	}
}