import java.util.*;
import java.lang.*;
import java.util.regex.*;

class Main
{
    public static void main (String[] args) throws java.lang.Exception
    {
        String number = "1212";
        Pattern p = Pattern.compile("(.{2})\\1");
        Matcher m = p.matcher(number); 
        if (m.find()) { 
            System.out.println("Найдено"); 
        }
    }
}