import java.util.List;
import java.util.Scanner;
import java.util.StringJoiner;
import java.util.TreeMap;
import java.util.Map;
// 注意类名必须为 Main, 不要有任何 package xxx 信息
public class Main {
public static void main(String[] args) {
Scanner in = new Scanner(System.in);
TreeMap<String,Integer> map=new TreeMap<>();
while(in.hasNextLine()){
String url=in.nextLine();
if(url.replaceAll("[0-9]","").length()==0){//仅数字
//TreeMap<String,String> mapTop=new TreeMap<>();
List<String[]> listTop=new ArrayList<>();
for(Map.Entry<String,Integer> tmp:map.entrySet()){
listTop.add(new String[]{tmp.getValue()+"",tmp.getKey()});
}
listTop.sort((a,b)->Integer.valueOf(a[0])!=Integer.valueOf(b[0])?
Integer.valueOf(b[0])-Integer.valueOf(a[0]):a[1].com
pareTo(b[1]));
int top=Integer.parseInt(url);
StringJoiner sj=new StringJoiner(",");
for(int i=0;i<top;i++){
sj.add(listTop.get(i)[1]);
}
System.out.println(sj.toString());
}else{
Integer count=map.get(url)==null?0:map.get(url+"");
map.put(url,++count);
}
}
}
}
