#include<bits/stdc++.h>
using namespace std;
int main(){
	int a,b,c,t;
	scanf("%d %d %d",&a,&b,&c);
	if(a>b){
		t=a;
		a=b;
		b=t;
	}
	if(b>c){
		t=b;
		b=c;
		c=t;
	}
	if(a>b){
		t=a;
		a=b;
		b=t;
    } 
    if(a+b<=c){
        printf("Not triangle\n");	
    }else if(pow(a,2)+pow(b,2)==pow(c,2)){
    	printf("Right triangle\n");
	}else if(pow(a,2)+pow(b,2)>pow(c,2)){
		printf("Acute triangle\n");	
	}else if(pow(a,2)+pow(b,2)<pow(c,2)){
		printf("Obtuse triangle\n");
	}
	if(a==b||a==c||b==c){
		printf("Isosceles triangle\n");	
	} 
	if(a==b&&a==c){
		printf("Equilateral triangle\n");
    }
	return 0;
}