#define _CRT_SECURE_NO_WARNINGS
#include <stdio.h>
#include <string.h>

char s[105];

int main() 
{
	int a, b, c;
	scanf("%d%d%d", &a, &b, &c);
	if (a + b<c && a - b>c)
		printf("Not triangle\n");
	if (a * a + b * b == c * c)
		printf("Right triangle\n");
	if (a * a + b * b > c * c)
		printf("Acute triangle\n");
	if (a * a + b * b < c * c)
		printf("Obtuse triangle");
	if (a == b || b == c || c == a)
		printf("Isosceles triangle\n");
	if (a == b == c)
		printf("Equilateral triangle\n");
	return 0;
}