#include<bits/stdc++.h>
using namespace std;
const int N=10;
int num[N];
int main()
{
    
    for(int i=0;i<3;i++)
    cin>>num[i];
 
    sort(num,num+3);
    int a=num[0],b=num[1],c=num[2];
    
    if(c-b>=a||a+b<=c)printf("Not triangle\n");
    if(a*a+b*b==c*c)printf("Right triangle\n");
    if(a*a+b*b>c*c)printf("Acute triangle\n");
    if(a*a+b*b<c*c)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;
}