#include<stdio.h>
#include<math.h>
int main(void)
{
	int a[3],i,j,m;
	for(i=0;i<3;i++)
		scanf("%d",&a[i]);
	for(i=0;i<2;i++) //从小到大 
		for(j=0;j<2-i;j++)
		{
			if(a[j]>a[j+1])
			{
				m=a[j];
				a[j]=a[j+1];
				a[j+1]=m;	
			}	
		}
	if((a[0]+a[1]>a[2]) && (a[0]+a[2]>a[1]) && (a[1]+a[2]>a[0]))
	{
		if(pow(a[0],2)+pow(a[1],2)==pow(a[2],2))
			printf("Right triangle\n");
		if(pow(a[0],2)+pow(a[1],2)>pow(a[2],2))
			printf("Acute triangle\n");
		if(pow(a[0],2)+pow(a[1],2)<pow(a[2],2))
			printf("Obtuse triangle\n");
		if((a[0]==a[1] || a[0]==a[2] || a[1]==a[2]))
			printf("Isosceles triangle\n");
		if(a[0]==a[1] && a[1]==a[2])
			printf("Equilateral triangle\n");	
	}
	else
		printf("Not triangle\n"); 
	return 0;
}