Problem:
Search II

You are given a sequence of n integers S and a sequence of different q integers T. Write a program which outputs C, the number of integers in T which are also in the set S.

Input

In the first line n is given. In the second line, n integers are given. In the third line q is given. Then, in the fourth line, q integers are given.

Output

Print C in a line.

Constraints

Elements in S is sorted in ascending order

n ≤ 100000

q ≤ 50000

0 ≤ an element in S ≤ 109

0 ≤ an element in T ≤ 109

Sample Input 1

5
1 2 3 4 5
3
3 4 1

Sample Output 1

3

Sample Input 2

3
1 2 3
1
5

Sample Output 2

0

Sample Input 3

5
1 1 2 2 3
2
1 2

Sample Output 3

2

Notes

Solution in Rust (judge verdict: Accepted)

use std::str::FromStr;
use std::collections::{HashMap,HashSet,VecDeque,BinaryHeap};
use std::cmp::{max,min,Ordering};
use std::io::Read;

fn main() {

    let mut buf = String::new();
    std::io::stdin().read_to_string(&mut buf).unwrap();
    let mut buf_it = buf.split_whitespace();

    let N = buf_it.next().unwrap().parse::<usize>().unwrap();
    let A = (0..N).map(|_| buf_it.next().unwrap().parse::<isize>().unwrap()).collect::<HashSet<_>>();

    let M = buf_it.next().unwrap().parse::<usize>().unwrap();
    let B = (0..M).map(|_| buf_it.next().unwrap().parse::<isize>().unwrap()).collect::<HashSet<_>>();

    let ans = A.intersection(&B).collect::<HashSet<_>>().len();
    println!("{}",ans);
}