#include <iostream>
#include <fstream>
#include <map>
using namespace std;

int main(int argc, char* argv[]) {
    if (argc != 2) {
        cerr << "Usage: " << argv[0] << " inputfile" << endl;
        return 1;
    }

    ifstream fin(argv[1]);
    if (!fin) {
        cerr << "Error opening file " << argv[1] << endl;
        return 1;
    }

    // Map to count frequencies; using find/insert instead of operator[].
    map<int, int> counts;
    int number;
    while (fin >> number) {
        map<int, int>::iterator it = counts.find(number);
        if (it != counts.end()) {
            it->second = it->second + 1;
        } else {
            counts.insert(pair<int, int>(number, 1));
        }
    }

    // Find the maximum frequency.
    int maxCount = 0;
    for (map<int, int>::iterator it = counts.begin(); it != counts.end(); ++it) {
        if (it->second > maxCount) {
            maxCount = it->second;
        }
    }

    // Print all numbers with frequency equal to maxCount.
    cout << "Modes: ";
    for (map<int, int>::iterator it = counts.begin(); it != counts.end(); ++it) {
        if (it->second == maxCount) {
            cout << it->first << " ";
        }
    }
    cout << endl;

    return 0;
}