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

namespace TriangleFormations
{
    class Program
    {
        static void Main(string[] args)
        {
            int sideA = int.Parse(Console.ReadLine());
            int sideB = int.Parse(Console.ReadLine());
            int sideC = int.Parse(Console.ReadLine());

            if (sideA + sideB >= sideC || sideC + sideB >= sideA)
            {
                Console.WriteLine("Triangle is valid.");
                if (sideA * sideA + sideB * sideB == sideC * sideC)
                {
                    Console.WriteLine("Triangle has a right angle between sides a and b");
                }
                else if (sideC * sideC + sideA * sideA == sideB * sideB)
                {
                    Console.WriteLine("Triangle has a right angle between sides a and c");
                }
                else if (sideB * sideB + sideC * sideC == sideA * sideA)
                {
                    Console.WriteLine("Triangle has a right angle between sides b and c");
                }
                else
                {
                    Console.WriteLine("Triangle has no right angles");
                }

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


         //   if (2 * sideA + 2 * sideB != 2 * sideC || 2 * sideC + 2 * sideA != 2 * sideB || 2 * sideB + 2 * sideC != 2 * sideA)
         //   {
         //       Console.WriteLine("Invalid Triangle");
          //  }
        }
    }
}