import java.io.PrintWriter;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;
import java.util.Scanner;

public class B {
	static Scanner in;
	static PrintWriter out;
	static String INPUT = "";
	
	static void solve()
	{
		char[] S = in.nextLine().toCharArray();
		char w = 'ｗ';
		int max = 0;
		int ws = 0;
		List<Integer> ends = new ArrayList<>();
		for(int i = 0;i < S.length;i++){
			char c = S[i];
			if(c == w){
				ws++;
				if(ws == max){
					ends.add(i);
				}else if(ws > max){
					max = ws;
					ends.clear();
					ends.add(i);
				}
			}else{
				ws = 0;
			}
		}
		if(ends.isEmpty()){
			out.println();
		}else{
			for(int end : ends){
				if(end-max == -1)continue;
				int start = end-max;
				while(start >= 0 && S[start] != w)start--;
				for(int i = start+1;i <= end-max;i++){
					out.print(S[i]);
				}
				out.println();
			}
		}
	}
	
	public static void main(String[] args) throws Exception
	{
		in = INPUT.isEmpty() ? new Scanner(System.in) : new Scanner(INPUT);
		out = new PrintWriter(System.out);
		
		solve();
		out.flush();
	}
	
	static int ni() { return Integer.parseInt(in.next()); }
	static long nl() { return Long.parseLong(in.next()); }
	static double nd() { return Double.parseDouble(in.next()); }
	static void tr(Object... o) { if(INPUT.length() != 0)System.out.println(Arrays.deepToString(o)); }
}