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

bool solver(char a,char b, char c){
    string s="ｗ";
    if(a==s[0]&&b==s[1]&&c==s[2]) return true;
    else return false;
}

int main(){
    string s;
    vector<string> v;
    int cnt=0,sum=1,p=0;
    cin >> s;

    for(int i=0;i<s.size();i+=3){
        if(solver(s[i],s[i+1],s[i+2])) cnt++;
        if(!solver(s[i],s[i+1],s[i+2])||i==s.size()-3){
            if(i==s.size()-3) i=s.size();
            if(cnt==sum) v.push_back(s.substr(p,i-p-cnt*3));
            if(sum<cnt) {
                v.clear();
                if(s.substr(p,i-p-cnt*3)!="") sum=cnt;
                if(cnt>0){
                    v.push_back(s.substr(p,i-p-cnt*3));
                }
            }
            if(cnt>0) p=i;
            cnt=0;
        }
    }

    if(v.size()==0) cout << "" << endl;

    for(vector<string>::iterator iter=v.begin();iter<v.end();iter++){
        if(""!=*iter||v.size()==1) cout << *iter << endl;
    }

    return 0;
}