N=int(input())
P=[list(map(int,input().split())) for _ in range(N)]
P_num=[P[i][0] for i in range(N)]
ans=[]
for x in range(1,max(P_num)+1):
    for y in range(N):
        try:
            ans.append(P[y][x])
        except:
            pass
print(*ans)