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