#include <bits/stdc++.h>
#define rep(i,n) for(int i = 0; i < (n); i++)
using namespace std;
typedef long long ll;

int main(){
    cin.tie(0);
    ios::sync_with_stdio(0);
    
    string S; cin >> S;
    vector<string> ans;
    int N = S.size();
    int ma = 0;
    rep(i,N) {
        while(i < N && S.substr(i, 3) == "ｗ") i += 3;
        int j = i;
        while(i < N && S.substr(i, 3) != "ｗ") i++;
        string T = S.substr(j, i - j);
        j = i;
        while(i < N && S.substr(i, 3) == "ｗ") i += 3;
        if(ma < i - j) {
            ma = i - j;
            ans.clear();
            ans.push_back(T);
            i--;
        } else if(ma == i - j) {
            ans.push_back(T);
        }
    }

    if(ma == 0) {
        cout << "\n";
    } else {
        for(auto a : ans) cout << a << "\n";
    }
}