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


 

  public  class C {
	
	InputStream is;
	static PrintWriter out;
  static LinkedList<pair> l[];
  static HashMap<Integer,Integer> mp;
  static ArrayList<Integer> path;
  static Stack<Integer> s;   
	static int ind[];
	static int outd[];
	static int vis[];
 
  static int pppp;   
    static boolean graphHasEulerianPath(int n)
    {
      int sn=0,en=0;
      for(int i=0;i<n;i++)
      {
        if(outd[i]-ind[i]>1 || ind[i]-outd[i]>1) return false;
        else if(ind[i]-outd[i]==1) en++;
        else if(outd[i]-ind[i]==1) sn++;
      }
      
      if((sn==0 && en==0)||(sn==1 && en==1))
        return true;
      return false;
    }
     
    static int findStartNode(int n)
    {
      int start=0;
      for(int i=0;i<n;i++)
      {
        if(outd[i]-ind[i]==1)
          return i;
        if(outd[i]>0){
          start=i;
          
        }
        
      }
      
      return start;
    }
     
    static void euler(int u)
    {
      vis[u]=1;s.add(u);
      while(outd[u]<l[u].size()){
        int x=l[u].get(outd[u]).x;
        int idx=l[u].get(outd[u]).y;
        outd[u]++;
        if(mp.containsKey(idx)) continue;
        mp.put(idx,1);
        euler(x);
      } 
      path.add(s.pop());
    }
  
   void solve()
   {
     int t=ni();
     while(t-->0)
     {
       int n=ni(),m=ni();
       l=new LinkedList[n+1];
       for(int i=0;i<=n;i++) l[i]=new LinkedList<pair>();
       ind=new int[n+1];outd=new int[n+1];mp=new HashMap<Integer,Integer>();
       int edge=0;vis=new int[n+1];
       for(int i=0;i<m;i++)
       {
         int u=ni(),v=ni();
         l[u].add(new pair(v,i));         
         l[v].add(new pair(u,i));         
         ind[u]++;
         ind[v]++;
         edge++;
       }
       int ans=0;
       for(int i=1;i<=n;i++){
         if(ind[i]%2!=0){
           l[0].add(new pair(i,edge));
           l[i].add(new pair(0,edge++));}else ans++;} out.println(ans);
          
       for(int i=0;i<n;i++){
         if(vis[i]==0){
           path=new ArrayList<Integer>();
           s=new Stack<Integer>();
           euler(i);
           for(int ii=0;ii<path.size()-1;ii++){
             if(path.get(ii)==0 || path.get(ii+1)==0) continue;
             out.println(path.get(ii)+" "+path.get(ii+1));
           }}}
     }
   } 
         
       
         
       
       
         
       
       
    
      
   static class pair
   {
     int x;
     int y;
     pair(int x,int y)
     {
       this.x=x;
       this.y=y;
     }
   }
            
       
      
      
    
		
	
		
	
	
	
	
	
	
	
 
	 
	
	 
	 
	 
	 
	 
	 
	 
	 
	
	 
	
	
	
 
 
	
	  
	  
	
    //---------- I/O Template ----------
    
    public static void main(String[] args) { new C().run(); }
    void run() { 
        is = System.in; 
        out = new PrintWriter(System.out);
        solve();
        out.flush();
    }
    
    byte input[] = new byte[1024];
    int len = 0, ptr = 0;
    
    int readByte() { 
        if(ptr >= len) { ptr = 0; 
            try { len = is.read(input); } 
            catch(IOException e) { throw new InputMismatchException(); } 
            if(len <= 0) { return -1; } 
        } return input[ptr++];
    }
    boolean isSpaceChar(int c) { return !( c >= 33 && c <= 126 ); }
    int skip() { 
        int b = readByte(); 
        while(b != -1 && isSpaceChar(b)) { b = readByte(); } 
        return b;
    }
    
    char nc() { return (char)skip(); }
    String ns() { 
        int b = skip(); 
        StringBuilder sb = new StringBuilder(); 
        while(!isSpaceChar(b)) { sb.appendCodePoint(b); b = readByte(); } 
        return sb.toString();
    }
    String nLine() { 
        int b = skip(); 
        StringBuilder sb = new StringBuilder(); 
        while( !(isSpaceChar(b) && b != ' ') ) { sb.appendCodePoint(b); b = readByte(); } 
        return sb.toString();
    }
    int ni() { 
        int n = 0, b = readByte(); 
        boolean minus = false; 
        while(b != -1 && !( (b >= '0' && b <= '9') || b == '-')) { b = readByte(); } 
        if(b == '-') { minus = true; b = readByte(); } 
        if(b == -1) { return -1; }  //no input 
        while(b >= '0' && b <= '9') { n = n * 10 + (b - '0'); b = readByte(); } 
        return minus ? -n : n;
    }
    long nl() { 
        long n = 0L;    int b = readByte(); 
        boolean minus = false; 
        while(b != -1 && !( (b >= '0' && b <= '9') || b == '-')) { b = readByte(); } 
        if(b == '-') { minus = true; b = readByte(); } 
        while(b >= '0' && b <= '9') { n = n * 10 + (b - '0'); b = readByte(); } 
        return minus ? -n : n;
    }
 
    double nd() { return Double.parseDouble(ns()); }
    float nf() { return Float.parseFloat(ns()); }
    int[] na(int n) { 
        int a[] = new int[n]; 
        for(int i = 0; i < n; i++) { a[i] = ni(); } 
        return a;
    }
    char[] ns(int n) { 
        char c[] = new char[n]; 
        int i, b = skip(); 
        for(i = 0; i < n; i++) { 
            if(isSpaceChar(b)) { break; } 
            c[i] = (char)b; b = readByte(); 
        } return i == n ? c : Arrays.copyOf(c,i);
    }
	static void pa(int a[])
	{
		for(int i=0;i<a.length;i++)
		out.print(a[i]+" ");
	
	}
	 static void pa(long a[])
	{
		for(int i=0;i<a.length;i++)
		out.print(a[i]+" ");
		out.println();
	}
	
}