有会py的大佬帮帮蒟蒻吗。。。

有A有WA有T。。。

就很烦

tmp = input().split()
n, m, p = int(tmp[0]), int(tmp[1]), int(tmp[2])
tong = [0] * (m + 1)
for i in range(n):
    tmp = input().split()
    num = int(tmp[0])
    for j in range(1, num + 1):
        tong[int(tmp[j])] += 1
ans = 0
endd = []
for i in range(1, m + 1):
    if tong[i] == p:
        ans += 1
        endd.append(i)
print(ans)
for i in endd:
    print(i)