ten.java

说明在java压缩包中

import java.awt.*;
import java.io.*;
import java.util.Vector;
public class Ten
{
	public static void main(String args[])
	{
		Vector vct = new Vector();
		char ch;
		String InputStr="";
		try
		{
			BufferedReader stdin =new BufferedReader(new InputStreamReader(System.in));
			InputStr=stdin.readLine();
			int slength = InputStr.length();
			for(int i=0;i<slength;i++)
			{
				ch = InputStr.charAt(i);
				vct.addElement(new Character(ch));
			}
			for(int i=0;i<slength-1;i++)
				for(int j=i+1;j<slength;j++)
				{
					if(vct.elementAt(i).equals(vct.elementAt(j)))
					{
						vct.removeElementAt(j);
						slength--;
					}
				}
			for(int i=slength-1;i>=0;i--)
			{
				System.out.print(vct.elementAt(i));
			}
			System.out.println();
		}
		catch(IOException e)
		{
			System.out.println(e.getMessage());
		}
	}
}