/* 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
	{
		System.out.println(replaceEmoji("{a} {b} {c}")); 
		System.out.println(replaceEmoji("abc")); 
	}
	public static String replaceEmoji(String string) {
        if (string == null || string.isEmpty()) return string;
        Matcher m = Pattern.compile("\\{(\\w+)}").matcher(string);
        StringBuilder sb = new StringBuilder();
        while (m.find()) {
            m.appendReplacement(
                    sb,
                    "<<" + m.group(1) + ">>"
                    //Emojis.getEmoji(m.group(1))
            );
        }
        m.appendTail(sb);
 
        return sb.toString();
    }
 
}

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