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import java.util.*;
import java.util.Map.Entry;
public class Main{
    public static void main(String[] args){
        Scanner in = new Scanner(System.in);
        int n = in.nextInt();
        HashMap<String, Integer> map = new HashMap<>();
        for(int i = 0; i < n; i++){
            int m = in.nextInt();
            in.nextLine();
            HashSet<String> set = new HashSet<>();
            for(int j = 0; j < m; j++){
                String tmp = in.nextLine();
                String[] str = tmp.split(" ");
                String one = str[0] + str[2];
                if(!set.contains(one)){
                    set.add(one);
                    if(!map.containsKey(one))
                        map.put(one, 1);
                    else
                        map.put(one, map.get(one) + 1);
                }
            }
        }
        List<String> list = new ArrayList<>();
        for(Entry<String, Integer> entry : map.entrySet()){
            if(entry.getValue() == n)
                list.add(entry.getKey().substring(0, 9));
        }
        Collections.sort(list);
        for(int i = 0; i < list.size(); i++)
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