Consider the following process. You have a binary string (a string where each character is either 0 or 1) w of length n and an integer x. You build a new binary string s consisting of n characters. The i-th character of s is chosen as follows:

  * if the character w_{i-x} exists and is equal to 1, then s_i is 1 (formally, if i > x and w_{i-x} =  1, then s_i =  1); 
  * if the character w_{i+x} exists and is equal to 1, then s_i is 1 (formally, if i + x ≤ n and w_{i+x} =  1, then s_i =  1); 
  * if both of the aforementioned conditions are false, then s_i is 0. 



You are given the integer x and the resulting string s. Reconstruct the original string w.

Input

The first line contains one integer t (1 ≤ t ≤ 1000) — the number of test cases.

Each test case consists of two lines. The first line contains the resulting string s (2 ≤ |s| ≤ 10^5, each character of s is either 0 or 1). The second line contains one integer x (1 ≤ x ≤ |s| - 1).

The total length of all strings s in the input does not exceed 10^5.

Output

For each test case, print the answer on a separate line as follows:

  * if no string w can produce the string s at the end of the process, print -1; 
  * otherwise, print the binary string w consisting of |s| characters. If there are multiple answers, print any of them. 

Example

Input


3
101110
2
01
1
110
1


Output


111011
10
-1
import java.io.*;
import java.util.*;
public class d6182 implements Runnable 
{
    private boolean console=false;
    
    public void solve() 
    {
    	int i;
    	char s[]=in.ns().toCharArray();
    	int n=s.length;
    	int x=in.ni();
    	int ans[]=new int[n];
    	Arrays.fill(ans, 1);
    	for(i=0;i<n;i++)
    	{
    		if(s[i]=='0')
    		{
    			if(i+x<n)
    				ans[i+x]=0;
    			if(i>=x)
    				ans[i-x]=0;
    		}
    	}
    	for(i=0;i<n;i++)
    	{
    		if(s[i]=='1')
    		{
    			if(i+x<n)
    			{
    				if(ans[i+x]==1)
    					continue;
    			}
    			if(i>=x)
    			{
    				if(ans[i-x]==1)
    					continue;
    			}
    			out.println(-1);
    			return;
    		}
    	}
    	for(i=0;i<n;i++)
    		out.print(ans[i]);
    	out.println();
    }
    @Override
    public void run() {
        try {  init();  } 
        catch (FileNotFoundException e) {  e.printStackTrace();   }
        
        int t= in.ni();
        
        while (t-->0) {
            solve();
            out.flush(); }
    }
    private FastInput in;    private PrintWriter out;
    public static void main(String[] args) throws Exception {	 new d6182().run();	 }
    
    private void init() throws FileNotFoundException {
        InputStream inputStream = System.in; 	 OutputStream outputStream = System.out;
        try {  if (!console && System.getProperty("user.name").equals("sachan")) {
                outputStream = new FileOutputStream("/home/sachan/Desktop/output.txt");
                inputStream = new FileInputStream("/home/sachan/Desktop/input.txt");   	}
        }	catch (Exception ignored) {	}
        out = new PrintWriter(outputStream); 	 in = new FastInput(inputStream);
    }
    static class FastInput { InputStream obj;
    	public FastInput(InputStream obj) {	this.obj = obj;	}
        byte inbuffer[] = new byte[1024];  int lenbuffer = 0, ptrbuffer = 0;
        int readByte() { if (lenbuffer == -1) throw new InputMismatchException();
            if (ptrbuffer >= lenbuffer) { ptrbuffer = 0;
                try { lenbuffer = obj.read(inbuffer);  }
                catch (IOException e) { throw new InputMismatchException(); } }    
            if (lenbuffer <= 0) return -1;return inbuffer[ptrbuffer++]; }
        
        String ns() { int b = skip();StringBuilder sb = new StringBuilder();
            while (!(isSpaceChar(b)))	  { sb.appendCodePoint(b);b = readByte(); }return sb.toString();}
        
        int ni() { int num = 0, b;boolean minus = false;
            while ((b = readByte()) != -1 && !((b >= '0' && b <= '9') || b == '-')) ;
            if (b == '-') { minus = true;b = readByte(); }
            while (true) { if (b >= '0' && b <= '9') { num = num * 10 + (b - '0'); } else {
                    return minus ? -num : num; }b = readByte(); }}
        
        long nl() { long num = 0;int b;boolean minus = false;
            while ((b = readByte()) != -1 && !((b >= '0' && b <= '9') || b == '-')) ;
            if (b == '-') { minus = true;b = readByte(); }
            while (true) { if (b >= '0' && b <= '9') { num = num * 10L + (b - '0'); } else {
                    return minus ? -num : num; }b = readByte(); } }
        
        boolean isSpaceChar(int c) { return (!(c >= 33 && c <= 126)); }
        int skip() { int b;while ((b = readByte()) != -1 && isSpaceChar(b)) ;return b; }
        float nf() {return Float.parseFloat(ns());}
        double nd() {return Double.parseDouble(ns());}
        char nc() {return (char) skip();}
    }
}
 