import static java.lang.System.*;
import java.util.*;

public class Main {
	static Scanner sc = new Scanner(System.in);
	public static void main(String[] args) {
		String s = sc.nextLine();
		s = s.replaceFirst("^ｗ+","");
		s = s.replaceAll("[^ｗ]+$","");
		
		List<String> listA = new LinkedList(Arrays.asList(s.split("ｗ+")));
		List<String> listB = new LinkedList(Arrays.asList(s.split("[^ｗ]+")));
		listB.remove(0);
		
		if (listB.size()==0) {
			out.println(""); return;
		}
		
		int max = Integer.MIN_VALUE;
		for (int i=0; i<listB.size(); i++) {
			if (listB.get(i).length() > max) {
				max = listB.get(i).length();
			}
		}
		
		for (int i=0; i<listA.size(); i++) {
			if (listB.get(i).length() == max) out.println(listA.get(i));
		}
	}
}