Problem Description

Score: $ 200 $ points

Tsukukoma Paken had activities over $ N $ days during the winter vacation.

On the $ i $th day of activity, $ k_i $ members participated, and the names of the participants were $S_{i,1},\ S_{i,2},\ldots,\ S_{i,k_i}$.

How many members participated in all $ N $ days of activity, i.e., received the Perfect Attendance Award? Note that there are no members with the same name.

Input Format

The input is given from the standard input in the following format:

\(N\)
\(k_1\)
\(S_{1,1}\) \(S_{1,2}\) \(\ldots\) \(S_{1,k_1}\)
\(k_2\)
\(S_{2,1}\) \(S_{2,2}\) \(\ldots\) \(S_{2,k_2}\)
\(⋮\)
\(k_N\)
\(S_{N,1}\) \(S_{N,2}\) \(\ldots\) \(S_{N,k_N}\)

Output Format

Output the number of members who received the Perfect Attendance Award. Do not forget to add a newline at the end of the output.

Sample Input and Output

Sample Input #1

2
2
kaage penguinman
2
penguinman rho

Sample Output #1

1

Sample Input #2

3
1
penguinman
1
kaage
1
rho

Sample Output #2

0

Sample Input #3

3
3
a b c
2
a ba
3
a ba abc

Sample Output #3

1

Notes/Hints

None

见题面 Input 部分

见题面 Output 部分