import sys
from collections import deque

def main():
    n = int(sys.stdin.readline())
    queues = []
    total_customers = 0
    for _ in range(n):
        parts = list(map(int, sys.stdin.readline().split()))
        p_i = parts[0]
        customers = parts[1:]
        queues.append(deque(customers))
        total_customers += p_i
    
    manual_queue = []
    
    while total_customers > 0:
        for i in range(n):
            if len(queues[i]) > 0:
                customer = queues[i].popleft()
                manual_queue.append(str(customer))
                total_customers -= 1
                if total_customers == 0:
                    break
    
    print(' '.join(manual_queue))

if __name__ == "__main__":
    main()