#include <bits/stdc++.h>
#define INIT std::ios::sync_with_stdio(false);std::cin.tie(0);
#define VAR(type, a) type a;std::cin>>a;
// VAR(int, x);
#define OUT(d) std::cout<<(d);
#define SP std::cout<<" ";
#define ENDL std::cout<<"\n";
#define VEC(type, c, n) std::vector<type> c(n);for(auto& i:c)std::cin>>i;
#define MAT(type, c, m, n) std::vector<std::vector<type>> c(m, std::vector<type>(n));for(auto& r:c)for(auto& i:r)std::cin>>i;
#define ALL(a) (a).begin(),(a).end()
#define FOR(i,a,b) for (int i=(a);i<(b);++i)
#define RFOR(i,a,b) for (int i=(b)-1;i>=(a);--i)
#define REP(i,n) for (int i=0;i<(n);i++)
#define RREP(i,n) for (int i=(n)-1;i>=0;i--)

using ll = long long;
ll Factrial(ll n){
    if(!n) return 1;
    return n*Factrial(n-1);
}

signed main(){
    INIT;
    VAR(std::string, s);
    std::string w = "ｗ";
    std::vector<std::string> vecS;
    std::vector<int> wNum;
    std::string pre = "";
    std::string t = "";
    int cnt = 0;
    int maxCnt = 0;
    int beginNum = 0;
    for(; s.substr(beginNum, w.size())==w; beginNum+=w.size());
    for(int i=beginNum; i<s.size(); i+=w.size()){
        std::string now = s.substr(i, w.size());
        if(now==w && pre==w){
            ++cnt;
        }else if(now!=w && pre==w){
            vecS.push_back(t);
            wNum.push_back(cnt);
            maxCnt = std::max(maxCnt, cnt);
            cnt = 0;
            t = now;
        }else if(now!=w){
            t += now;
        }
        pre = now;
    }
    if(pre==w){
        vecS.push_back(t);
        wNum.push_back(cnt);
        maxCnt = std::max(maxCnt, cnt);
    }
    REP(i, wNum.size()){
        if(wNum[i]==maxCnt){
            OUT(vecS[i])ENDL;
        }
    }
    return 0;
}