import java.util.*;

public class Main {
	static Scanner sc = new Scanner(System.in);
	public static void main(String[] args) {
		String s = sc.next();
		String[] sentence = new String[100];
		Arrays.fill(sentence,"");
		int[] grass = new int[100];
		
		int m = 0; //0なら文章長カウントモード、1なら草カウントモード
		int n = 0; //現在何番目の文章と草を調べているか
		int max_grass = -1; //最も長い草の長さ
		StringBuilder sb = new StringBuilder();
		for (int i=0; i<s.length(); i++) {
			if (m==0 && s.charAt(i)!='ｗ') {
				sb.append(s.charAt(i));
			}
			else if (m==0 && s.charAt(i)=='ｗ') {
				sentence[n] = sb.toString();
				sb.setLength(0);
				m = 1;
				i--;
			}
			else if (m==1 && s.charAt(i)=='ｗ') {
				grass[n]++;
				max_grass = Math.max(max_grass,grass[n]);
			}
			else if (m==1 && s.charAt(i)!='ｗ') {
				m = 0;
				n++;
				i--;
			}
		}

		if (s.contains("ｗ")==false || s.replace("ｗ","").equals("")) {System.out.println("");}
		else {
			for (int i=0; i<100; i++) {
				if (grass[i]==max_grass) {
					if (sentence[i].equals("")==false) {System.out.println(sentence[i]);}
				}
			}
		}
	}
}