Problem: There are n cities and m two-way roads in Berland, each road connects two cities. It is known that there is no more than one road connecting each pair of cities, and there is no road which connects the city with itself. It is possible that there is no way to get from one city to some other city using only these roads.

The road minister decided to make a reform in Berland and to orient all roads in the country, i.e. to make each road one-way. The minister wants to maximize the number of cities, for which the number of roads that begins in the city equals to the number of roads that ends in it.

Input

The first line contains a positive integer t (1 ≤ t ≤ 200) — the number of testsets in the input.

Each of the testsets is given in the following way. The first line contains two integers n and m (1 ≤ n ≤ 200, 0 ≤ m ≤ n·(n - 1) / 2) — the number of cities and the number of roads in Berland. 

The next m lines contain the description of roads in Berland. Each line contains two integers u and v (1 ≤ u, v ≤ n) — the cities the corresponding road connects. It's guaranteed that there are no self-loops and multiple roads. It is possible that there is no way along roads between a pair of cities.

It is guaranteed that the total number of cities in all testset of input data doesn't exceed 200.

Pay attention that for hacks, you can only use tests consisting of one testset, so t should be equal to one.

Output

For each testset print the maximum number of such cities that the number of roads that begins in the city, is equal to the number of roads that ends in it.

In the next m lines print oriented roads. First print the number of the city where the road begins and then the number of the city where the road ends. If there are several answers, print any of them. It is allowed to print roads in each test in arbitrary order. Each road should be printed exactly once. 

Example

Input

2
5 5
2 1
4 5
2 3
1 3
3 5
7 2
3 7
4 2


Output

3
1 3
3 5
5 4
3 2
2 1
3
2 4
3 7

Solution (in JAVA):

Solution:
import com.sun.org.apache.xpath.internal.operations.Bool;

import java.io.*;
import java.util.*;

public class E_375_div2
{
    public static final Random RANDOM = new Random(System.currentTimeMillis());
    private static BufferedReader bufferedReader = new BufferedReader(new InputStreamReader(System.in));
    private static StringTokenizer stringTokenizer = null;
    private static PrintWriter out = new PrintWriter(new BufferedOutputStream(System.out));

    private static String next() throws IOException
    {
        while ((stringTokenizer == null) || (!stringTokenizer.hasMoreTokens()))
        {
            stringTokenizer = new StringTokenizer(bufferedReader.readLine());
        }
        return stringTokenizer.nextToken();
    }

    public static int nextInt() throws IOException
    {
        return Integer.parseInt(next());
    }

    public static double nextDouble() throws IOException
    {
        return Double.parseDouble(next());
    }

    public static long nextLong() throws IOException
    {
        return Long.parseLong(next());
    }

    public static String nextLine() throws IOException
    {
        return bufferedReader.readLine();
    }

    public static void close()
    {
        out.close();
    }

    public static void main(String[] args)
    {
        try
        {
            solve();
        } catch (IOException exception)
        {
            exception.printStackTrace();
        }
        close();
    }

    public static class City implements Comparable<City>
    {
        public final int number;
        public final Set<Road> roads;

        public City(int number)
        {
            this.number = number;
            roads = new TreeSet<>();
        }

        @Override
        public int compareTo(City that)
        {
            int result;
            if (this.number == that.number)
            {
                result = 0;
            }
            else
            {
                if (this.number < that.number)
                {
                    result = -1;
                }
                else
                {
                    result = 1;
                }
            }
            return result;
        }

        public String toString()
        {
            return "" + (this.number + 1);
        }
    }

    public static class Road implements Comparable<Road>
    {
        public final int number;
        public final City from;
        public final City to;
        public Boolean direction;

        public Road(int number, City from, City to)
        {
            this.number = number;
            this.from = from;
            this.to = to;
            direction = null;
            this.from.roads.add(this);
            this.to.roads.add(this);
        }

        @Override
        public int compareTo(Road that)
        {
            int result;
            if (this.number == that.number)
            {
                result = 0;
            }
            else
            {
                if (this.number < that.number)
                {
                    result = -1;
                }
                else
                {
                    result = 1;
                }
            }
            return result;
        }

        public String toString()
        {
            return this.direction ? this.from + " " + this.to : this.to + " " + this.from;
        }
    }

    public static void walk(Set<Road> roads, City city)
    {
        Road roadNew = null;
        for (Road road : city.roads)
        {
            if (road.direction == null)
            {
                roadNew = road;
            }
        }
        if (roadNew != null)
        {
            roadNew.direction = roadNew.from == city;
            City cityNew = roadNew.direction ? roadNew.to : roadNew.from;
            roads.remove(roadNew);
            walk(roads, cityNew);
        }
    }

    public static void solve() throws IOException
    {
        int t = nextInt();
        for (int indexTest = 0; indexTest < t; indexTest++)
        {
            int n = nextInt();
            City[] cities = new City[n];
            for (int indexCity = 0; indexCity < n; indexCity++)
            {
                cities[indexCity] = new City(indexCity);
            }
            int m = nextInt();
            TreeSet<Road> roads = new TreeSet<>();
            TreeSet<Road> roadsOriginal = new TreeSet<>();
            int indexRoad = 0;
            for (; indexRoad < m; indexRoad++)
            {
                Road road = new Road(indexRoad, cities[nextInt() - 1], cities[nextInt() - 1]);
                roads.add(road);
                roadsOriginal.add(road);
            }
            TreeSet<City> citiesOdd = new TreeSet<>();
            for (City city : cities)
            {
                if (city.roads.size() % 2 == 1)
                {
                    citiesOdd.add(city);
                }
            }
            Iterator<City> iterator = citiesOdd.iterator();
            while (iterator.hasNext())
            {
                roads.add(new Road(indexRoad, iterator.next(), iterator.next()));
                indexRoad += 1;
            }
            while (!roads.isEmpty())
            {
                walk(roads, roads.first().from);
                if (!roads.isEmpty())
                {
                    walk(roads, roads.first().to);
                }
            }
            out.println(n - citiesOdd.size());
            for (Road road : roadsOriginal)
            {
                out.println(road);
            }
        }
    }
}