n = int(input())
r = [[int(i) for i in input().split()] for j in range(n)]
k = 0
ans = []
while not all(r[i][0] == 0 for i in range(n)):
    if r[k][0] != 0:
        ans += [r[k].pop(1)]
        r[k][0] -= 1
    k = (k+1)%n
    # print(all(r[i][0] == 0 for i in range(n)))
for i in ans:
    print(i)