N = int(input())
max_n = 0
ans_l = []
for i in range(N):
    l = list(map(int, input().split()))
    max_n = max(max_n, l[0])
    ans_l.append(l[1:])

for i in range(N):
    if max_n - len(ans_l[i]) >= 1:
        ans_l[i] = ans_l[i] + [0 for i in range(max_n - len(ans_l[i]))]

# print(ans_l)
l_T = list(zip(*ans_l))
# print(l_T)
ans = ""
for i in range(max_n):
    ll = [j for j in l_T[i] if j != 0]
    ans += ' '.join(map(str,ll))
    ans += " "
    # for j in range(N):
        # if l_T[i][j] == 0:
        #     continue
        # else:
        #     ans = ans + str(l_T[i][j]) + " "


# for i in range(max_n):
#     for j in range(N):
#         if ans_l[j][i] == 0:
#             continue
#         else:
#             ans = ans + str(ans_l[j][i]) + " "

print(ans)