package Sun26062011;

import java.util.*;
import java.io.*;

public class ProblemC
{
    public static void main(String[] args) throws FileNotFoundException
    {
        Scanner sc = new Scanner(new File("src/Sun26062011/ProbCText.txt"));

        int longestSize = 0;
        String longestWord = "";

        while(sc.hasNext())
        {
            String s = sc.next();

            if(s.equals("E-N-D"))
            {
                break;
            }



            int size = checkSize(s);

            if(size > longestSize)
            {
                longestSize = size;
                longestWord = s;
            }
        }

        System.out.println(longestWord.toLowerCase());
    }

    private static int checkSize(String s)
    {
        String s2 = s.trim();

        s2 = clearSymbol(s2,"-");
        s2 = clearSymbol(s2,".");
        s2 = clearNumber(s2);

        return s2.length();
    }

    private static String clearNumber(String s)
    {
        for (int i = 0 ; i < s.length() ; i++)
        {
            if(Character.isDigit(s.charAt(i)))
            {
                s = s.substring(0,i) + s.substring(i+1);
                i--;
            }
        }

        return s;
    }

    private static String clearSymbol(String s,String s2)
    {
        int idx = -1;
        while((idx = s.indexOf(s2))!=-1)
        {
            s = s.substring(0,idx) + s.substring(idx+1);
        }
        return s;
    }
}