Problem: Our beloved detective, Sherlock is currently trying to catch a serial killer who kills a person each day. Using his powers of deduction, he came to know that the killer has a strategy for selecting his next victim.

The killer starts with two potential victims on his first day, selects one of these two, kills selected victim and replaces him with a new person. He repeats this procedure each day. This way, each day he has two potential victims to choose from. Sherlock knows the initial two potential victims. Also, he knows the murder that happened on a particular day and the new person who replaced this victim.

You need to help him get all the pairs of potential victims at each day so that Sherlock can observe some pattern.

Input

First line of input contains two names (length of each of them doesn't exceed 10), the two initials potential victims. Next line contains integer n (1 ≤ n ≤ 1000), the number of days.

Next n lines contains two names (length of each of them doesn't exceed 10), first being the person murdered on this day and the second being the one who replaced that person.

The input format is consistent, that is, a person murdered is guaranteed to be from the two potential victims at that time. Also, all the names are guaranteed to be distinct and consists of lowercase English letters.

Output

Output n + 1 lines, the i-th line should contain the two persons from which the killer selects for the i-th murder. The (n + 1)-th line should contain the two persons from which the next victim is selected. In each line, the two names can be printed in any order.

Examples

Input

ross rachel
4
ross joey
rachel phoebe
phoebe monica
monica chandler


Output

ross rachel
joey rachel
joey phoebe
joey monica
joey chandler


Input

icm codeforces
1
codeforces technex


Output

icm codeforces
icm technex

Note

In first example, the killer starts with ross and rachel. 

  * After day 1, ross is killed and joey appears. 
  * After day 2, rachel is killed and phoebe appears. 
  * After day 3, phoebe is killed and monica appears. 
  * After day 4, monica is killed and chandler appears. 

Solution (in JAVA):

Solution:
import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.OutputStream;
import java.io.OutputStreamWriter;
import java.io.PrintWriter;
import java.util.ArrayList;
import java.util.HashSet;
import java.util.StringTokenizer;
public class Main
{
    static BufferedReader reader;
    static StringTokenizer tokenizer;
    static void init(InputStream input)
    {
        reader = new BufferedReader( new InputStreamReader(input) );
        tokenizer = new StringTokenizer("");
    }
    static String next() throws IOException
    {
        while ( ! tokenizer.hasMoreTokens() )
        {
            tokenizer = new StringTokenizer(reader.readLine() );
        }
        return tokenizer.nextToken();
    }
 
    static long nextInt() throws IOException
    {
        return Long.parseLong( next() );
    }
    public static int ri() throws IOException
    {
    	return (int)nextInt() ;
    }
    public static long rl() throws IOException
    {
    	return nextInt() ;
    }
    public static double rd() throws NumberFormatException, IOException
    {
    	return Double.parseDouble(next()) ;
    }
    static void print_a(int [] arr)
    {
    	for(int i = 0 ;i<arr.length ; i++)
    	{
    		print(arr[i]+" ") ;
    	}
    	println() ;
    }
    public static int [] ria() throws IOException
    {
    	int n = ri() ;
    	int [] a = new int[n] ;
    	for(int i = 0 ; i<n ; i++)
    	{
    		a[i] = ri() ;
    	}
    	return a ;
    }
    public static long [] rla() throws IOException
    {
    	int n = ri() ;
    	long [] a = new long[n] ;
    	for(int i =0 ; i<n ; i++)
    	{
    		a[i] = rl() ;
    	}
    	return a ;
    }
    public static int p(int i)
    {
    	return (int)Math.pow(2,i) ;
    }
    static PrintWriter writer;
    static void outit(OutputStream outputStream)
    {
        writer = new PrintWriter(new BufferedWriter(new OutputStreamWriter(outputStream)));
    }
    static void print(Object...objects) {
        for (int i = 0; i < objects.length; i++) {
            if (i != 0)
                writer.print(' ');
            writer.print(objects[i]);
        }
    }
 
    static void println(Object...objects) {
        print(objects);
        writer.println();
    }
 
    static void close() {
        writer.close();
    }
 
    static void flush() {
        writer.flush();
    }
    static ArrayList<ArrayList<Integer>> sieve ;
    static long [] mob ;
    static int len;
    static int[][] up;
    static int[] tin;
    static int[] tout;
    static int time;
    static int n ;
    static int [] a ;
    static int []flat ;
    static int k ;
    static int [] bl_id ;
    static int [] ctr_ver ;
    static int [] ctr_val ;
    static int curr_l ;
    static int curr_r ;
    public static void main(String [] args) throws IOException
    {
        init(System.in) ;
        outit(System.out) ;
//    	int t = (int)nextInt() ;
//    	for(int i =0 ; i<t ; i++)
        output() ;
        flush() ;
        close() ;
    }
    public static void output() throws IOException
    {
    	String a = next() ;
    	String b = next() ;
    	HashSet<String> hs = new HashSet<String>() ;
    	hs.add(a) ;
    	hs.add(b) ;
    	int n = ri() ;
    	for(String s : hs)
		{
			print(s+" ") ;
		}
		println();
    	for(int i = 0 ;i<n ; i++)
    	{
    		String a1 = next() ;
    		String a2 = next() ;
    		hs.remove(a1) ;
    		hs.add(a2) ;
    		for(String s : hs)
    		{
    			print(s+" ") ;
    		}
    		println();
    	}
    }
}