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

public class Main {

	BufferedReader in;
	StringTokenizer str = null;
	PrintWriter out;
	
	private String next() throws Exception{
		while (str == null || !str.hasMoreElements())
			str = new StringTokenizer(in.readLine());
		return str.nextToken();
	}
	
	private int nextInt() throws Exception{
		return Integer.parseInt(next());
	}
	
	private long nextLong() throws Exception{
		return Long.parseLong(next());
	}
	
	private double nextDouble() throws Exception{
		return Double.parseDouble(next());
	}
	
	public void run() throws Exception{
		in =  new BufferedReader(new InputStreamReader(System.in));
		out = new PrintWriter(System.out);
		int t = nextInt();
		for(int i = 0; i < t; ++i) solve();
		out.close();
	}

	int n, m;
	List<Integer> []g;
	List<Edge> e;

	boolean []used;
	List<Integer> comp;

	List<int[]> ans;
	int ret = 0;
	
	private void solve() throws Exception {
		n = nextInt();
		m = nextInt();
		g = new LinkedList[n];
		for(int i = 0; i < n; ++i) {
			g[i] = new LinkedList<>();
		}
		e = new ArrayList<>();

		for(int i = 0; i < m; ++i) {
			int v = nextInt() - 1, u = nextInt() - 1;
			
			g[v].add(e.size());
			e.add(new Edge(v, u, false));

			g[u].add(e.size());
			e.add(new Edge(u, v, false));
		}
		
		used = new boolean[n];
		comp = new LinkedList<>();
		
		ret = 0;
		ans = new LinkedList<>();
		
		for(int i = 0; i < n; ++i) {
			if (!used[i]) {
				comp.clear();
				dfs(i);
				
				euler(comp);
			}
		}
		out.println(ret);
		for(int[]i : ans) {
			out.println(i[0] + " " + i[1]);
		}
		// System.out.println();
	}

	private void euler(List<Integer> comp) {
		// System.out.println("component = " + comp);
		List<Integer> odd = new ArrayList<>();
		for(int i : comp) {
			if (g[i].size() % 2 == 1) {
				odd.add(i);
			}
		}

		// System.out.println("odd = " + odd);
		
		// add fake edges to make euler cycle possible.
		for(int i = 0; i < odd.size(); i += 2) {
			int u = odd.get(i), v = odd.get(i + 1);
			g[v].add(e.size());
			e.add(new Edge(v, u, true));

			g[u].add(e.size());
			e.add(new Edge(u, v, true));
		}

		List<Edge> path = new ArrayList<>();
		Stack<Integer> stack = new Stack<>();
		stack.add(comp.get(0));

		int []ptr = new int[n];
		while(stack.size() > 0) {
			int v = stack.peek();
			boolean found = false;
			while(ptr[v] < g[v].size()) {
				int id = g[v].get(ptr[v]);
				Edge edge = e.get(id);
				if (edge.used) {
					++ptr[v];
					continue;
				}
				
				e.get(id).used = true;
				e.get(id ^ 1).used = true;

				stack.add(edge.to);
				path.add(edge);
				found = true;
				++ptr[v];
				
				break;
			}

			if (!found) {
				stack.pop();
			}
		}

		// Euler cycle.
		// Collections.reverse(path);
		// System.out.println(path);

		int []degin = new int[n];
		int []degout = new int[n];
		for(int i = 0; i < path.size(); i++) {
			Edge edge = path.get(i);
			int v = edge.from, u = edge.to;
			if (edge.fake) continue;
			ans.add(new int[]{v + 1, u + 1});
			degout[v]++;
			degin[u]++;
		}

		for(int i : comp) {
			if (degin[i] == degout[i]) {
				++ret;
			}
		}
	}

	private void dfs(int v) {
		used[v] = true;
		comp.add(v);
		for(int i : g[v]) {
			int to = e.get(i).to;
			if (!used[to]) {
				dfs(to);
			}
		}
	}

	class Edge {
		int from, to;
		boolean used, fake;
		public Edge(int from, int to, boolean fake) {
			this.from = from;
			this.to = to;
			this.fake = fake;
			this.used = false;
		}

		public String toString() {
			return "from = " + from + ", to = " + to + ", fake = " + fake;
		}
	}
		
	public static void main(String[] args) throws Exception{
		new Main().run();
	}
}