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

}else {
	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)||(b==c)||(a==c)){
printf("Isosceles triangle\n");
}
if(a==b&&b==c){
printf("Equilateral triangle\n");
}
}




return 0;
}