#include <stdio.h>
#include <stdlib.h>
int main()
{
int i,a,b,c,a2,b2,c2;
scanf("%d%d%d",&a,&b,&c);
a2=aa;
b2=bb;
c2=c*c;
if(a+b<c||a+c<b||b+c<a)
{
i=0;
}
if((a2+b2==c2)||(b2+c2==a2)||(a2+c2==b2))
{
i=1;
}
if((a2+b2>c2)||(b2+c2>a2)||(a2+c2>b2))
{
i=2;
}
if((a2+b2<c2)||(b2+c2<a2)||(a2+c2<b2))
{
i=3;
}
if((a==b)||(b==c)||(a==c))
{
i=4;
}
if(a==b==c)
{
i=5;
}
switch(i){
case 0:printf("Not triangle");break;
case 1:printf("Right triangle");break;
case 2:printf("Acute triangle"); break;
case 3:printf("Obtuse triangle"); break;
case 4:printf("Isosceles triangle"); break;
case 5:printf("Equilateral triangle"); break;
}
return 0;
}