/* package whatever; // don't place package name! */
 
import java.util.*;
import java.lang.*;
import java.io.*;
 
/* Name of the class has to be "Main" only if the class is public. */
class Ideone
{
	public static void main (String[] args) throws java.lang.Exception
	{
        BufferedReader reader = new BufferedReader(new InputStreamReader(System.in));
        ArrayList<Integer> list = new ArrayList<Integer>();
        InputStream inStream = new FileInputStream(reader.readLine());
 
        while (inStream.available() > 0)
        {
            Integer g = inStream.read();
            if (g % 2 == 0)
            {
                list.add(g);
            }
        }
        sort(list);
        for (Integer e : list)
        {
            System.out.println(e);
        }
 
    }
}

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