#include <bits/stdc++.h>
using namespace std;
int a[3];
int main()
{
    for (int i=0;i<3;i++)
        cin>>a[i];
    sort(a,a+3);
    if (a[0]+a[1]>a[2] || a[0]+a[2]>a[1] || a[1]+a[2]>a[0])
    {
        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<<"Isosceles triangle"<<endl;
        if (a[0]==a[1] && a[1]==a[2])
            cout<<"Equilateral triangle"<<endl
    }
    else
        cout<<"Not triangle";
    return 0;
}