n = int(input())
info = [list(map(int, input().split())) for i in range(n)]

max_len = 0
for i in range(n):
    max_len = max(info[i][0], max_len)

ans = []
for j in range(max_len):
    for i in range(n):
        if j+1 < len(info[i]):
            ans.append(info[i][j+1])
print(*ans)