import sys
read = sys.stdin.buffer.read
readline = sys.stdin.buffer.readline
readlines = sys.stdin.buffer.readlines

import numpy as np

N = int(readline())
A = np.zeros((N, 110), np.int32)
for i in range(N):
    p, *a = map(int, readline().split())
    A[i,:p] = a

A = A.T.ravel()
answer = A[A > 0]
print(' '.join(answer.astype(str)))