n = int(input())
Lines = []
length = 0
for _ in range(n):
    line = list(map(int,input().split()))
    Lines.append(line)
    length += len(line)-1

order = []
while len(order) < length:
    for line in Lines:
        if line[0] > 0:
            order.append(line[1])
            line[0] -= 1
            line.pop(1)
print(*order)