using System;
class PikimSona{
   public static void Main(string[] arg){
      Console.WriteLine("Palun lause: ");
      string lause=Console.ReadLine();
      string[] sonad=lause.Split(" .,!".ToCharArray());
      string pikim=sonad[0];
      for(int i=1; i<sonad.Length; i++){
        if(sonad[i].Length>pikim.Length){
           pikim=sonad[i];
        }
      }
      Console.WriteLine(pikim);
   }
}