N=int(input())
P=[[] for i in range(N)]
na=0
for i in range(N):
    buf=list(map(int,input().split()))
    P[i]=buf[1:]
    na=max(buf[0],na)
ans=[]
for i in range(na):
    for j in range(N):
        try:
            ans.append(P[j][i])
        except:
            continue
print(" ".join(map(str,ans)))