int task7 () {
    string s;
    getline(cin, s);
    string valid_ip = "YES";
    string number;
    cout << s.length() << endl;
    int num_count = 0;
    int dots_count = 0;
    for (int i = 0; i < s.length(); i++) {
        if (s[i] >= '0' && s[i] <= '9') {
            number.push_back(s[i]);
            num_count++;
        }
        if ((s[i] != '.') && (!(s[i] >= '0' && s[i] <= '9'))) {
            valid_ip = "NO";
            break;
        }
        if (s[i] == '.' || i == s.length() - 1) {
            if (s[i] == '.') {
                dots_count++;
            }
            if (num_count == 0 || num_count > 3) {
                valid_ip = "NO";
                break;
            }
            num_count = 0;
            int num1 = stoi(number);
            if (num1 > 255) {
                valid_ip = "NO";
                break;
            }
            number.clear();
        }
        if (s.length() > 16 || s.length() < 7) {
            valid_ip = "NO";
            break;
        }
    }
    if (dots_count != 3) {
        valid_ip = "NO";
    }
    cout << valid_ip;
    return 0;
}