from collections import deque
registers = []
n = int(input())
for x in range(n):
    registers.append(deque([int(k) for k in input().split()[1:]]))

isEmpty = False

line = []
while registers:
    for re in registers:
        indices = []
        if not re:
            indices.append(registers.index(re))
            continue
        else:
            line.append(re.popleft())
    for i in indices:
        registers.pop(i)

print(*line)