cn-lab4-server-rp

int main()
{
    string s;
    while (true) {
        cin >> s;
        if (s == "&close")
            break;
        if (s.length() % 4 == 0)
            s = s.substr(s.length() / 2, s.length()) + s.substr(0, s.length() / 2);
        cout << s;
    }
    return 0;
}