import java.util.Set;
public class my {
public static void main(String[] args) {
HashSet list=new HashSet();
List list2=new ArrayList();
String str1="";
Scanner n=new Scanner(System.in);
while(true)
{
str1=n.nextLine();
if(str1.equals("end"))
break;
else {
list.add(str1);
}
}
Iterator it = list.iterator(); //(1)iterator()方法获取迭代器
while (it.hasNext()){ //(2)hasNext()方法控制迭代
String element = (String)it.next(); //(3)next()方法获取迭代元素，需要强转
list2.add(element);
}
Collections.sort(list2);
int i;
for( i=0;i<list2.size()-1;i++)
{
System.out.print(list2.get(i)+", ");
}
System.out.print(list2.get(i));
}
}