Java 代码

import java.util.Scanner;

public class Main
{
    public static void main(String[] args)
    {
        Scanner cin = new Scanner(System.in);

        String s = cin.nextLine();

        String[] w = s.substring(0, s.length()-1).split(" ");

        String mw = "";
        for (int i = 0; i < w.length; i ++)
        {
            if (w[i].length() > mw.length () )
                mw = w[i];
        }

        System.out.println (mw);
    }
}