import sys
if sys.platform =='ios':
	import clipboard
	a=clipboard.get()
	a = a.split('\n')
	text = '\n'.join(a)
	with open('input_file.txt','w') as f:
		f.write(text)
	sys.stdin = open('input_file.txt')
sys.setrecursionlimit(4100000)
stdin = sys.stdin 
ni = lambda: int(ns())
na = lambda: list(map(int, stdin.readline().split()))
ns = lambda: stdin.readline().strip()

n = ni()
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)