hello I inputted the code but it threw up all sorts of errors?

import java.util.TreeSet;

public class TreeSetQuestion $\{$

public static void main$($String$[]$ args$)\{$

$//$ Create a new TreeSet to store Winter Olympic sports

TreeSet winterSports $=$ new TreeSet$<>()$;

$//$ Add elements as instructed $($Step $2)$

winterSports.add$("$figure skating"$)$;

winterSports.add$("$alpine skiing"$)$;

winterSports.add$("$bobsleigh$")$;

winterSports.add$("$rowing$")$;

winterSports.add$("$snowboarding$")$;

$//$ Print the initial contents of the TreeSet

System.out.println$("$Initial TreeSet contents:"$)$;

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

$\}$

$\}$

$//$ Remove "rowing"

winterSports.remove$("$rowing$")$;

boolean containsRowing $=$ winterSports.contains$("$rowing$")$;

$/*****$ DO NOT CHANGE THE CODE BELOW THIS LINE $*****/$

System.out.println$()$;

System.out.println$("$Does the TreeSet contain 'rowing'? $"+$ containsRowing$)$;

System.out.println$()$;

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

$\}$

$\}$

STDOUT

TreeSetQuestion.java:$21$: error: class, interface, or enum expected

winterSports.remove$("$rowing$")$;

$^$

TreeSetQuestion.java:$22$: error: class, interface, or enum expected

boolean containsRowing $=$ winterSports.contains$("$rowing$")$;

$^$

TreeSetQuestion.java:$25$: error: class, interface, or enum expected

System.out.println$()$;

$^$

TreeSetQuestion.java:$26$: error: class, interface, or enum expected

System.out.println$("$Does the TreeSet contain 'rowing'? $"+$ containsRowing$)$;

$^$

TreeSetQuestion.java:$27$: error: class, interface, or enum expected

System.out.println$()$;

$^$

TreeSetQuestion.java:$28$: error: class, interface, or enum expected

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

$^$

TreeSetQuestion.java:$30$: error: class, interface, or enum expected

$\}$

$^$

$7$ errors

Expected STDOUT

$[$alpine skiing, bobsleigh, figure skating, rowing, snowboarding$]$

Does the TreeSet contain 'rowing'? false

$[$alpine skiing, bobsleigh, figure skating, snowboarding$]$