N = int(input())
P = [list(map(int,input().split())) for l in range(N)]
num=[]
for i in range(N):
    num.append(P[i][0])

ans=[]

for i in range(1,max(num)+1):
    for j in range(N):
        try:
            ans.append(P[j][i])
        except:
            pass

print(' '.join(list(map(str,ans))))