n = int(input())
lis = [[] for i in range(105)]
for i in range(n):
    l = list(map(int,input().split()))
    for j,a in enumerate(l[1:]):
        lis[j].append(a)
        
        
ans = []
for l in lis:
    for a in l:
        ans.append(a)
print(*ans)