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

public class Solution {
    public static void main(String[] args) {
        /* Enter your code here. Read input from STDIN. Print output to STDOUT. Your class should be named Solution. */
        StringBuilder builder = new StringBuilder();
        Scanner in = new Scanner(System.in);
        int n = in.nextInt();
        int k = in.nextInt();
        String s = in.next();
        int[] arr = new int[n];
        arr[0] = Character.digit(s.charAt(0),2);
        int prev = arr[0];
        System.out.print(arr[0]);
        for (int i=1; i<n; i++) {
            if (i-k >=0) {
                prev = prev ^ arr[i-k];
            }
            arr[i] = prev ^ Character.digit(s.charAt(i), 2);
            prev = prev ^ arr[i];
            builder.append((char)(arr[i] + '0'));
        }
        System.out.println(builder.toString());
    }
}