#include<stdio.h>
int main()
{
	int a,b,c,t1,t2,t3,t4,t5,t6,t7,t8;
	scanf("%d %d %d",&a,&b,&c);
	if(a<=b&&b>=c&&c>=a)
	{ 
	
	t1=b;
	b=c;
	c=t1;
}
	else if(c<=a&&c<=b&&a<=b)
	{
		t2=a;
		t3=b;
		a=c;
		b=t2;
		c=t3;
	 } 
	 else if(a>=b&&a<=c&&b<=c)
	 {
	 	t4=a;
	 	a=b;
	 	b=t4;
	 }
	 else if(a>=b&&a>=c&&c>=b)
	 {
	 	t5=a;
	 	t6=b;
	 	b=c;
	 	a=t6;
	 	c=t5;
	 }
	 else if(a>=b&&a>=c&&b>=c)
	 {
	 t7=a;
	 t8=b;
	 a=c;
	 b=t8;
	 c=t7;
}
		if(a+b<=c)
		{printf("Not triangle\n");
		}
		else
		{
		if(a*a+b*b==c*c)
		{printf("Right triangle\n");
		}
		else if(a*a+b*b>=c*c)
		{printf("Acute triangle\n");
			if(a==b&&a<=c)
			{printf("Isosceles\n");}
				if(a==b&&a==c)
				{printf("Equilateral triangle\n");
				}	
			
		}
		else if(a*a+b*b<c*c)
		{printf("Obtuse triangle\n");
		}
		}
	return 0;
}