n=int(input())
line=[]
for i in range(n):
    p=list(map(int,input().split()))
    if p[0]==0:
        continue
    
    a=p[1:][::-1]
    line.append(a)
ans=[]
while line:
    ne=[]
    for x in line:
        tmp=x.pop()
        ans.append(tmp)
        if len(x)!=0:
            ne.append(x)
    line=ne
print(*ans)