/* package whatever; // don't place package name! */
 
import java.util.*;
import java.lang.*;
import java.io.*;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
 
/* 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
	{
		final String regex = "\\b[0-9]+\\b(?! [A-Z])";
		final String string = "Error trying to POST to /shipments/28056415973/select?caller.id=116089592: 500 INTERNAL_SERVER_ERROR\n";
		final String subst = "XXXX";
 
		final Pattern pattern = Pattern.compile(regex);
		final Matcher matcher = pattern.matcher(string);
 
		final String result = matcher.replaceAll(subst);
 
		System.out.println(result);
 
	}
}

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