class C {

    private String clientVersion = "0.0.1";

    String getClientVersion() {
        return clientVersion;
    }

    void setClientVersion(String clientVersion) {
        this.clientVersion = clientVersion;
    }

    public static void main(String[] args) {

        System.out.println(Manager.getInstance().getClientVersion());

        System.out.println(Manager.getServerInstance().getClientVersion());
        System.out.println(Manager.getServerInstance().getServerVersion());
    }
}

class S extends C {

    private String serverVersion = "1.1.1";

    public String getServerVersion() {
        return serverVersion;
    }

    public void setServerVersion(String serverVersion) {
        this.serverVersion = serverVersion;
    }
}

class Manager {

    private static C instance = new S();

    public static C getInstance() {
        return instance;
    }

    public static S getServerInstance() {
        return (S) instance;
    }
}