1. MinBy

#include <iostream>
#include <sstream>
#include <string>
#include <vector>

using namespace std;

void minLexicographical(vector<string>& v) {
    string result = v[0];
    for (auto& el : v) {
        if (result > el) {
            result = el;
        }
    }
    cout << result << endl;
}

void minLength(vector<string>& v) {
    string result = v[0];
    for (auto& el : v) {
        if (result.length() > el.length()) {
            result = el;
        }
    }
    cout << result << endl;
}

void maxLength(vector<string>& v) {
    string result = v[0];
    for (auto& el : v) {
        if (result.length() < el.length()) {
            result = el;
        }
    }
    cout << result << endl;
}

int main()
{
    string line, word;
    getline(cin, line);

    istringstream ss(line);

    vector<string> words;

    while (ss >> word) {
        words.push_back(word);
    }

    int n;
    cin >> n;

    n == 1 ? minLexicographical(words) : n == 2 ? minLength(words) : maxLength(words);

    return 0;
}