What is output?

public class Vehicle $\{$

protected String vehicleName;

public void setName$($String name$)\{$

vehicleName $=$ name;

$]$

public String toString$()($

return vehicleName;

$\}$

$\}$

public class Boat extends Vehicle $\{$

private int numEngines;

public Boat$($int num$)\{$

numEngines $=$ num;

$]$

public String toString$()\{$

return super.toString $0+""+$ numEngines;

$\}$

$\}$

Boat fastBoat $=$ new Boat$(2)$;

fastBoat.setName$("$Firebird$")$;

System.out.println$($fastBoat$)$;

Firebird $2$

Firebird

Boat@f$35$a$442$b

Syntax error