using System;

public class Program

{

    public static void Main()

    {

        bool m;

        Console.Write("Input the string : ");

             string  str1 = Console.ReadLine(); 

​

        Console.Write("Input the substring to  search : ");

              string str2 = Console.ReadLine();

        m=str1.Contains(str2);

        if(m)

        {

            Console.Write("string exists");

        }

        else

        {

        Console.Write("string not exists"); 

        }

    }

}