n = int(input())
p_list = []
a_list = []
for i in range(n):
    input_list = list(input().split())
    p_list.append(int(input_list[0]))
    a_list.append(input_list[1:])
    
guest_list = []

while True:
    flag = 0
    for i in range(n):
        cur_num = p_list[i]
        if cur_num == 0:
            continue
        else:
            guest_list.append(a_list[i].pop(0))
            p_list[i] -= 1
            flag = 1
            
    if flag == 0:
        break
        
res = ' '.join(guest_list)
print(res)