N = int(input())
M = 10**2
arr = [[] for _ in range(M)]
for i in range(N):
    l = list(map(int,input().split()))
    P,A = l[0],l[1:]
    for j in range(P):
        arr[j].append(A[j])
ans = []
for i in arr:
    for j in i:
        ans.append(j)
print(*ans)