using System;

public class Program

{

    public static void Main()

    {

        int iAge;

        char cSymbol;

        Console.WriteLine("Welcome to the Age Classifier!");

        Console.Write("Please enter you age (Between 0 and 100): ");

        iAge = int.Parse(Console.ReadLine());

        if((iAge > 100) || (iAge<0))

        {

            cSymbol = 'I';

        }

        else if (iAge < 13)

        {

            cSymbol = 'C';

        }

        else if (iAge < 20)

        {

            cSymbol = 'T';

        }

        else if (iAge < 65)

        {

            cSymbol = 'A';

        }

        else (iAge > 65)

        {

            cSymbol = 'S';

        }

        switch (cSymbol)

        {

            case 'I':

                Console.WriteLine("Invalid age , please enter valid age");

                break;

            case 'C':

                Console.WriteLine("You are a child");

                break;

            case 'T':

                Console.WriteLine("You are a teenager");

                break;

            case 'A':

                Console.WriteLine("you are an adult");

                break;

            case 'S':

                Console.WriteLine("You are a senior citizen");

                break;

        }

        Console.WriteLine("Press  any key to exit");

    }

}