n=int(input())
line=[]
for _ in range(n):
    p=list(map(int,input().split()))
    if p[0]==0:
        continue
    a=p[1:][::-1]
    line.append(a)
ans=[]

while line:
    next_line=[]
    for i in line:
        tmp=i.pop()
        ans.append(tmp)
        if len(i)!=0:
            next_line.append(i)
    line=next_line
print(*ans)