N = int(input())
p = []
for i in range(N):
    line = input().split()
    if len(line)>=2:
        p.append(list(map(int,line[1:])))

max_ = max(max(p))
i = 0
idx = 0
while i< max_:
    if len(p[idx])!=0:
        print(p[idx].pop(0),end=' ')
        i += 1
    idx += 1
    if idx==len(p):
        idx = 0
print("")