import java.util.Iterator;
import java.lang.String;

public class Strs implements Iterable<String>
{
    //private Strs[] s;
    private StringBuilder s;
    private Strs first;
    private Strs second;

    void swap(String a, String b)
    {
        String temp = a;
        a = b;
        b = temp;
    }

    public Strs(String[] s)
    {
        this.first = s[0];
        this.second = s[1];
    }

    //iterator_create
    public Iterator<String> iterator()
    {
        return new It();
    }
    //

    //iterator
    private class It implements Iterator<String>
    {

        private int pos;

        public It()
        {
            pos = 0;
        }

        public boolean hasPrev()
        {
            return pos < s.length();
        }

        public String prev()
        {
            return s.substring(pos--, s.length());
        }
    }
    //

    //toString
    public String toString()
    {
        StringBuilder outStr = new StringBuilder("");
        outStr.append(this.first);
        outStr.append("   ");
        outStr.append(this.second);
        outStr.append(" => ");
        //outStr.append(this.sub); //common substring
        return String.valueOf(outStr);
    }
    //
}