import java.util.*;

class Main5{
	public static void main(String args[]){
		Scanner sc = new Scanner(System.in);
		int n = sc.nextInt();
		int[][] p = new int[n][];
		int[] nin = new int[n];
		int sum = 0;
		for(int i = 0; i < n; i++){
			nin[i] = sc.nextInt();
			sum += nin[i];
			p[i] = new int[nin[i]];
			for(int j = 0; j < nin[i]; j++){
				p[i][j] = sc.nextInt();
			}
		}
		int i = 0;
		boolean flag = true;
		while(flag){
			flag = false;
			for(int j = 0; j < n; j++){
				if(nin[j] > i){
					System.out.print(p[j][i] + " ");
					flag = true;
				}
			}
			i++;
		}
	}
}