#include <iostream>
#include <math.h>

using namespace std;

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

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

    return 0;
}