Envío 4249

Código

import java.util.*;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
public class Main {

      public static void main(String args[]){
		        
		    	Scanner entrada = new Scanner(System.in);
		        String string = entrada.nextLine();	        
		        Pattern pattern = null;
		        Matcher matcher = null;
		        int sum,sw;
		        sw=0;
		    	for(int i=0; i < string.length();i++) {
		    		sum=0;
		    		String regex = "";
		    		regex = string.substring(i,i+1) + "?";
		    		pattern = Pattern.compile(regex);
		    		matcher = pattern.matcher(string);
		    		
		    		while (matcher.find()) {
		    		 sum+=matcher.group(0).length();
			        }	
		    		if(sum > 1) {
		    			sw=1;
		    			break;
		    		}
		    	}
		    	
		    	System.out.println((sw!=0)?"yes":"no");
		    }
}