/* package whatever; // don't place package name! */
 
import java.util.*;
import java.lang.*;
import java.io.*;
 
/* Name of the class has to be "Main" only if the class is public. */
class Ideone
{
	public static void main (String[] args) throws java.lang.Exception
	{
	 String initial = "djsndni123412ndksnd3412*&^%34(*(*1234";
// remove all non-digits characters
	String processed = initial.replaceAll("\\D", "");
	StringBuilder sb = new StringBuilder(processed);
	System.out.println(sb);
	int gap = 0;
	for (int i = 4; i< sb.length()-1;i+=4){
		sb.insert(i + gap,' ');
		gap++;
	}
	System.out.println(sb);
	}
}

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