N = int(input())
P = []
A = []
for n in range(N):
    p, *a = map(int, input().split())
    P += [p]
    A += [[*a]]

ans = []
for i in range(100):
    for j in range(N):
        if i+1 <= P[j]:
            ans += [A[j][i]]
print(ans)