N=int(input())
na=[0]*N
P=[[] for i in range(N)]
for i in range(N):
    n,*p=map(int,input().split())
    na[i]=n
    P[i]=list(p)
for i in range(max(na)):
    for j in range(N):
        if i>=na[j]: continue
        print(P[j][i],end=' ')
print()