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