/* package whatever; // don't place package name! */
 
import java.util.*;
import java.lang.*;
import java.io.*;
import java.util.regex.Pattern;
import java.util.regex.Matcher;
 
/* 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 s = "[TEST][64894]HelloWorld[KGMObilians]";
Pattern patt = Pattern.compile("\\[(\\d+)\\]");
Matcher match = patt.matcher(s);
while(match.find()){
    System.out.println(match.group(1));
}
	}
}

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