import java.util.ArrayList;
import java.util.Arrays;
import java.util.HashSet;
import java.util.LinkedList;
import java.util.Scanner;
import java.util.Set;
import java.util.regex.Matcher;
import java.util.regex.Pattern;

public class Main {

	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		
		final String input = sc.nextLine().replaceFirst("^[[:space:]]+", "").replaceFirst("^ｗ+", "");
		final Pattern pat = Pattern.compile("(([^ｗ]+)(ｗ+))");
		
		//System.out.println(input + " " + pat);
		final Matcher mat = pat.matcher(input);
		
		LinkedList<String> answer = new LinkedList<String>();
		int max_len = 0;
		
		while(mat.find()){
			final String in = mat.group(2);
			final int w_len = mat.group(3).length();
			
			if(max_len > w_len){ continue; }
			if(max_len < w_len){ max_len = w_len; answer.clear(); }
			
			answer.add(in);
		}
		
		if(answer.size() == 0){ System.out.println(); }
		else{
			for(final String ans : answer){
				System.out.println(ans);
			}
		}
		
	}

}