//goo.gl/jJbyJf
int task6() {
    string s, next_long_word, last_long_word;
    int count = 1;
    getline(cin, s);
    //cout << s;
    for (int i = 0; i < s.length(); i++) {
        if (s[i] != ' ') {
            next_long_word.push_back(s[i]);
        }
        if (s[i] == ' ' || i == s.length() - 1) {
            if (next_long_word.length() > last_long_word.length() || last_long_word.empty()) {
                last_long_word = next_long_word;
            }
            next_long_word.clear();
        }
    }
    cout << last_long_word;
    return 0;
}