#include <bits/stdc++.h>
using namespace std;
typedef long long ll;

int main() {
    string s;
    cin>>s;
    int n=s.size();
    vector<string> ss;
    vector<int> w;
    int i=0;
    while (s.substr(i,3)=="ｗ") i+=3;
    while (i<n) {
        string t;
        while (i<n&&s.substr(i,3)!="ｗ") {
            t+=s.substr(i,3);
            i+=3;
        }
        ss.push_back(t);
        int cnt=0;
        while (i<n&&s.substr(i,3)=="ｗ") {
            cnt++;
            i+=3;
        }
        w.push_back(cnt);
    }
    int mx=0;
    for (int x:w) mx=max(mx,x);
    if (mx==0) {
        cout<<endl;
        return 0;
    }
    for (int i=0;i<w.size();i++) {
        if (w[i]==mx) {
            cout<<ss[i]<<endl;
        }
    }
    return 0;
}