namespace ConsoleApplication1
{
    class Program
    {
        static void Main(string[] args)
        {
            StreamReader reader = new StreamReader("D:\\test.txt");
            string s = reader.ReadLine();
            while (reader.EndOfStream != true)
            {
                if (reader.ReadLine().Length > s.Length)
                {
                    s = reader.ReadLine();
                }
                //Console.WriteLine(reader.ReadLine());

            }
            Console.WriteLine(s);
            Console.ReadKey();
        }
    }
}