import java.util.Scanner;

public class P2857 {
    public static void main(String[] args) {
        Scanner in = new Scanner(System.in);
        int n = in.nextInt();
        int[] mention = new int[101];
        boolean[][] by = new boolean[101][101];
        for (int i = 0; i < n; i++) {
            int sender = in.nextInt();
            int k = in.nextInt();
            for (int j = 0; j < k; j++) {
                int id = in.nextInt();
                if (id >= 0 && id <= 100) {
                    mention[id]++;
                    if (sender >= 0 && sender <= 100) by[id][sender] = true;
                }
            }
        }
        int bestId = 0;
        int bestCount = -1;
        for (int id = 0; id <= 100; id++) {
            if (mention[id] > bestCount) {
                bestCount = mention[id];
                bestId = id;
            }
        }
        System.out.println(bestId);
        StringBuilder sb = new StringBuilder();
        boolean first = true;
        for (int s = 0; s <= 100; s++) {
            if (by[bestId][s]) {
                if (!first) sb.append(' ');
                sb.append(s);
                first = false;
            }
        }
        System.out.println(sb.toString());
        in.close();
    }
}