N=int(input())

R=[list(map(int,input().split())) for i in range(N)]

LIST=[]

for i in range(N):
    for j in range(1,R[i][0]+1):
        LIST.append((j,i,R[i][j]))

LIST.sort()
ANS=[LIST[i][2] for i in range(len(LIST))]
print(*ANS)