N = int(input())
P = [0 for _ in range(N)]
A = [[] for _ in range(N)]
cnt = 0
for i in range(N):
    P[i],*A[i] = map(int,input().split())
    cnt += P[i]
i = 0
j = 0
while 1:
    if P[i%N] > 0:
        print(A[i%N].pop(0),end=" ")
        j += 1
        P[i%N] -=1
        if j == cnt:
            exit()
    i += 1