#include<algorithm>
#include<iostream>
using namespace std;
int main() {
    int a[3];
    cin>>a[0]>>a[1]>>a[2];
    sort(a,a+3);
    if(a[0]+a[1]<=a[2]) {
        cout<<"Not triangle"<<endl;
          return 0;
    }
    // if(a[0]==a[1]&&a[1]==a[2]) {
    //     cout<<"Equilateral triangle"<<endl;
    // }

    if(a[0]*a[0]+a[1]*a[1]==a[2]*a[2]) {
        cout<<"Right triangle"<<endl;
    }

      if(a[0]*a[0]+a[1]*a[1]>a[2]*a[2]) {
        cout<<"Acute triangle"<<endl;
    }
      if(a[0]*a[0]+a[1]*a[1]<a[2]*a[2]) {
        cout<<"Obtuse triangle"<<endl;
     }
    if(a[0]==a[1]&&a[1]==a[2]) {
        cout<<"Equilateral triangle"<<endl;
    }


    if( a[0]==a[1]||a[1]==a[2]||a[0]==a[2]) {
         cout<<"Isosceles triangle"<<endl;
     }


    return 0;
}