using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace _09.Triangle_Formations
{
    //You are given 3 integer numbers: a, b and c, which will represent the 3 sides of a triangle. Your task is to check whether the triangle is valid.
    // If it is, print "Triangle is valid.".
    //Otherwise print "Invalid Triangle." and end the program.
    //If it is valid, you have to check if it is a right triangle (a2 + b2 == c2).
    //If it is a right triangle, print "Triangle has a right angle between sides a and b", depending on which side forms a right angle.
    //If the sides b and c form a right angle, print "Triangle has a right angle between sides b and c", and so on.

    class Triangle
    {
        static void Main(string[] args)
        {
            int a = int.Parse(Console.ReadLine());
            int b = int.Parse(Console.ReadLine());
            int c = int.Parse(Console.ReadLine());

            if ((a * a) + (b * b) == (c * c) || (a * a) + (c * c) == (b * b) || (b * b) + (c * c) == (a * a) || (a == b && b == c))
            {
                Console.WriteLine("Triangle is valid.");
                if ((a * a) + (b * b) == (c * c)) Console.WriteLine("Triangle has a right angle between sides a and b");
                if ((a * a) + (c * c) == (b * b)) Console.WriteLine("Triangle has a right angle between sides a and c");
                if ((b * b) + (c * c) == (a * a)) Console.WriteLine("Triangle has a right angle between sides b and c");
                if (a == b && b == c) Console.WriteLine("Triangle has no right angles");

            }
            else
            {
                Console.WriteLine("Invalid Triangle.");
             }

        }
    }
}