import java.util.ArrayList;
import java.util.List;
import java.util.Scanner;

public class Main {
	public static void main(String[] args) {
		Scanner scan = new Scanner(System.in);
		String S = scan.nextLine();
		scan.close();
		if(S.substring(0, 1).equals("ｗ")) {
			for(int i = 0; i < S.length(); i++) {
				if(S.substring(i, i + 1).equals("ｗ")) {
					continue;
				}else {
					S = S.substring(i, S.length());
					break;
				}
			}
		}
		S = S + " ";
		String []ary = new String[S.length()];
		for(int i = 0; i < S.length(); i++) {
			ary[i] = S.substring(i, i + 1);
		}
		int l = ary.length;
		int max = 0;
		List<Data>list = new  ArrayList<Data>();
		int begin = 0;
		for(int i = 0; i < l; i++) {
			if(ary[i].equals("ｗ")) {
				int cnt = 1;
				int t = i;
				i++;
				while(i < l) {
					if(ary[i].equals("ｗ")) {
						cnt ++;
						i++;
						continue;
					}else {
						String s = S.substring(begin, t);
						begin = i;
						Data d = new Data(s, cnt);
						list.add(d);
						if(max < cnt) {
							max = cnt;
						}
						break;
					}
				}
			}
		}
		StringBuilder sb = new StringBuilder();
		for(int i = 0; i < list.size(); i++) {
			if(list.get(i).getN() == max) {
				sb.append(list.get(i).getS()).append("\n");
			}
		}
		System.out.print(sb.toString());
	}
}

class Data{
	String s;
	int n;
	public Data(String s, int n) {
		this.s = s;
		this.n = n;
	}
	String getS() {
		return s;
	}
	int getN() {
		return n;
	}
}