from collections import deque

n = int(input())
L = []
for _ in range(n):
    Q = deque(map(int, input().split()))
    Q.popleft()
    L.append(Q)

ANS = []
while True:
    cnt = 0
    for i in range(n):
        if L[i]:
            ANS.append(L[i].popleft())
        else:
            cnt += 1
    if cnt == n:
        break
print(*ANS)