#include <iostream>
#include <string>
#include <map>
using namespace std;
 
int main()
{
    freopen("input.txt", "r", stdin);
    map<string, int>q;
    string str, last;
    while (cin >> str){
        q[str]++;
        last = str;
    }
    int needCount = q[last];
    for (auto it = q.begin(); it != q.end(); it++) {
        if ((it->second) == needCount)
            cout << it->first << " ";
    }
}