D

#include <iostream>
#include <iomanip>
#include <string>
#include <sstream>
#include <algorithm>
#include <vector>
#include <stdlib.h>
#include <stdio.h>
#include <fstream>
#include <stack>
#include <map>
#include <cstring>
#include <cmath>
#include <set>
#include <iterator>
#include <cmath>

using namespace std;

istream & operator >> (istream & in, vector<int> & v)
{
    string str;
    getline(in,str);
    stringstream stream(str);
    int tmp;
    while(stream >> tmp)
        v.push_back(tmp);
    return in;
}

ostream & operator << (ostream & out, vector<int> const & v)
{
    for(int el: v)
        out << el << ' ';
    return out;
}


int main()
{
    string str;
    set<string> s;
    int ma = -1000;
    map<string,int> Kolvo;
    string a;
    while (cin >> a)
    {
        Kolvo.insert({a, 0});
        Kolvo[a]++;
        s.insert(a);
    }
    for (auto i = s.begin(); i != s.end(); ++i)
    {
        if (Kolvo[*i] > ma)
            {
                ma = Kolvo[*i];
                str = *i;
            }
    }
    cout << str;
}