#include <iostream>

using namespace std;

int main ()
{
    int x, y, z;
    int a, b;
    
    a = x^2 + y^2;
    b = z^2;
    
    cout << "Enter three angles : ";
    cin  >> x;
    cin  >> y;
    cin  >> z;

    if ( x != y && x != z )
        cout << "This is a isosceles triangle.\n";
    else if( a = b )
         cout << "This is a right triangle.\n";
    else
        cout << "This is a isosceles triangle.\n";

    return 0;
}