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