/* package whatever; // don't place package name! */
 
import java.util.*;
import java.lang.*;
import java.io.*;
import java.util.regex.*;
 
/* 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 testString = "\\u53ef\\u4ee5NonUnicode\\u544a\\u8bc9\\u6211";
		Pattern p = Pattern.compile("\\\\u([0-9a-f]{4})");
		Matcher m = p.matcher(testString);
		StringBuffer result = new StringBuffer();
		while(m.find()) {
  			int codePoint = Integer.parseInt(m.group(1), 16);
  			char[] chars = Character.toChars(codePoint);
  			m.appendReplacement(result, new String(chars));
		}
		m.appendTail(result);
		System.out.println(result);
	}
}

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