using System;

​

public class Program

{

    public static void Main()

    {

        Console.WriteLine("longest");

        //0<string symbols<=1 000 000

        //0<k<26

        string b1 = Console.ReadLine();

        int r = 0;

        string result = " ";

        int[] alphabet = new int[26];

        for (int i = 1; i < b1.Length; i++)

        {

            for (int j = 0; (i + j) < b1.Length; j++)

            {

                string str = b1.Substring(i, j + 1);

                //for (int p = 0; p < 26; p++);

                for (int p = 0; p < 26; p++)

                {

                alphabet[p]=0;  

                }

            }

        }

    }

}