Time Limit: 8 sec / Memory Limit: 64 MB





Example

Input

eggchickenegg


Output

egg
#include<iostream>
#include<string>
#include<algorithm>
#include<map>
#include<set>
#include<utility>
#include<vector>
#include<cmath>
#include<cstdio>
#define loop(i,a,b) for(int i=a;i<b;i++) 
#define rep(i,a) loop(i,0,a)
#define pb push_back
#define mp make_pair
#define it ::iterator
#define all(in) in.begin(),in.end()
const double PI=acos(-1);
const double ESP=1e-10;
using namespace std;
int main(){
  char d;
  int n=0,co=0;
  string out="";
  string tmp="";
  while(cin>>d){
    string in="";
    in+=d;
    if(d=='e')rep(i,2){
	cin>>d;
	in+=d;
      }
    else rep(i,6){
	cin>>d;
	in+=d;
      }
    if(tmp==in){
      if(n<co){
	out=in;
	n=co;
	co=1;
      }else
	co=1;
    }else if(tmp!=in){
      co++;
    }
    tmp=in;
  }
  if(n<co)out=tmp;
  cout<<out<<endl;
}