Time Limit: 8 sec / Memory Limit: 64 MB





Example

Input

eggchickenegg


Output

egg
#include<cstdio>
#include<cstdlib>
#include<cstring>
#include<cmath>
#include<cassert>
#include<iostream>
#include<sstream>
#include<string>
#include<vector>
#include<queue>
#include<set>
#include<map>
#include<utility>
#include<numeric>
#include<algorithm>
#include<bitset>
#include<complex>
#include<stack>

using namespace std;

typedef long long Int;
typedef vector<int> vint;
typedef pair<int,int> pint;
typedef vector<string> vstring;
typedef vector<pint> vpint;

struct Edge{int to,from,cost;};

#ifdef DEBUG
#define debug cout
#else
stringstream __ss__;
#define debug __ss__
#endif

template<class T> void pv(T a, T b) { for (T i = a; i != b; ++i) debug << *i << " "; debug << endl; }
template<class T> void chmin(T &t, T f) { if (t > f) t = f; }
template<class T> void chmax(T &t, T f) { if (t < f) t = f; }
int in() { int x; scanf("%d", &x); return x; }

#define rep(i,n) for(int i=0;i<(n);++i)
#define repd(i,n) for(int i=(n)-1;i>=0;i--)
#define repn(i,m,n) for(int i=(m);i<=(n);++i)
#define repnd(i,m,n) for(int i=(n)-1;i>=(m);i--)
#define rep0(i,n) for(i=0;i<(n);++i)
#define repd0(i,n) for(i=(n)-1;i>=0;i--)
#define repn0(i,m,n) for(i=(m);i<=(n);++i)
#define repnd0(i,m,n) for(i=(n)-1;i>=(m);i--)
#define all(n) n.begin(),n.end()
#define sz(n) ((int)(n).size())
#define IL for(;;)
#define MP make_pair
#define PB push_back
#define SS stringstream
#define X second
#define Y first
#define PUTLINE debug<<"LINE:"<<__LINE__<<endl;

const int INF = 2147483647/3;
const double EPS = 1e-10;
const double PI = acos(-1.0);

const int dx[]={1,-1,0,0,1,-1,1,-1,0};
const int dy[]={0,0,1,-1,1,-1,-1,1,0};



int main() {
	string str;
	cin>>str;
	string s="";
	int i=0;
	while(i<sz(str)){
		if(str[i]=='e'){
			s+="e";
			i+=3;
		}else{
			s+="c";
			i+=7;
		}
	}
	int j=0,r=1;
	string res=s.substr(0,1);
	rep0(i,sz(s)){
		if(i!=0&&s[i-1]==s[i]){
			if(r<i-j){
				r=i-j;
				res=s[i-1];
			}
			j=i;
		}
	}
	if(r<i-j){
		res=s[i-1];
	}
	if(res=="e")cout<<"egg"<<endl;
	else cout<<"chicken"<<endl;
	return 0;
}