import java.math.BigInteger;
import java.util.ArrayDeque;
import java.util.Queue;
import java.util.Scanner;

public class Main {
	public static void main(String[] args){
		Scanner sc = new Scanner(System.in);
		String s = sc.nextLine();
		int l = 0;
		int maxi = -1;
		String tmp = "",maxs = new String();
		Queue<String> que = new ArrayDeque<String>();
		int i = 0;
		for(;i < s.length();){
			l = 0;
			while(i < s.length() && s.charAt(i) != 'ｗ'){
				tmp = tmp + s.charAt(i);
				i++;
			}
			while(i < s.length() && s.charAt(i) == 'ｗ'){
				l++;
				i++;
			}
			if(l > maxi && tmp != ""){
				maxi = l;
				while(!que.isEmpty()){
					que.remove();
				}
				que.add(tmp);
				tmp = "";
			}else if(l == maxi && tmp != ""){
				que.add(tmp);
				tmp = "";
			}
		}
		if(l > maxi && tmp != ""){
			maxi = l;
			while(!que.isEmpty()){
				que.remove();
			}
			que.add(tmp);
			tmp = "";
		}else if(l == maxi && tmp != ""){
			que.add(tmp);
			tmp = "";
		}
		if(que.size() == 0){
			System.out.println(" ");
		}else{
			while(!que.isEmpty()){
				System.out.println(que.element());
				que.remove();
			}
		}
	}
}