import sys
input=lambda: sys.stdin.readline().rstrip()
n=int(input())
PA=[[int(i) for i in input().split()] for _ in range(n)]
Ans=[]
for i in range(1,100):
  for j in range(n):
    if i<=PA[j][0]:
      Ans.append(PA[j][i])
print(*Ans)