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)

#![allow(unused_imports)]
use std::cmp;
use std::collections::*;
use std::io::*;
use std::mem::swap;
#[allow(dead_code)]
struct Io<'a> {
    r: BufReader<StdinLock<'a>>,
    w: BufWriter<StdoutLock<'a>>,
    buf: VecDeque<String>,
    buf_str: String,
}
#[allow(dead_code)]
impl<'a> Io<'a> {
    fn r<T: std::str::FromStr>(&mut self) -> T {
        if self.buf.len() == 0 {
            self.r.read_line(&mut self.buf_str).unwrap();
            for w in self.buf_str.split_whitespace() {
                self.buf.push_back(w.to_owned());
            }
            self.buf_str.clear();
        }
        self.buf
            .pop_front()
            .unwrap()
            .parse()
            .unwrap_or_else(|_| panic!())
    }
    fn r_s(&mut self) -> String {
        if self.buf.len() == 0 {
            self.r.read_line(&mut self.buf_str).unwrap();
            for w in self.buf_str.split_whitespace() {
                self.buf.push_back(w.to_owned());
            }
            self.buf_str.clear();
        }
        self.buf.pop_front().unwrap()
    }
    fn w<T: std::fmt::Display>(&mut self, v: T) {
        write!(self.w, "{}", v).unwrap();
    }
    fn wl<T: std::fmt::Display>(&mut self, v: T) {
        writeln!(self.w, "{}", v).unwrap();
    }
    fn iter<'b, T: std::str::FromStr>(&'b mut self) -> IoIter<'a, 'b, T> {
        IoIter {
            io: self,
            p: std::marker::PhantomData,
        }
    }
}
#[allow(dead_code)]
struct IoIter<'a: 'b, 'b, T: std::str::FromStr> {
    io: &'b mut Io<'a>,
    p: std::marker::PhantomData<T>,
}
#[allow(dead_code)]
impl<'a, 'b, T: std::str::FromStr> Iterator for IoIter<'a, 'b, T> {
    type Item = T;
    fn next(&mut self) -> Option<T> {
        Some(self.io.r())
    }
}
fn main() {
    let stdin = stdin();
    let stdout = stdout();
    let r = BufReader::new(stdin.lock());
    let w = BufWriter::new(stdout.lock());
    let io = Io {
        r,
        w,
        buf: VecDeque::new(),
        buf_str: String::new(),
    };
    unsafe {
        problem(io);
    }
}

unsafe fn problem(mut io: Io) {
    let n: usize = io.r();
    let s: Vec<usize> = io.iter().take(n).collect();
    let q: usize = io.r();
    let t: Vec<usize> = io.iter().take(q).collect();

    let mut count = 0;
    'a: for ti in t {
        let mut start = 0;
        let mut end = s.len();

        while start != end {
            let mid = (start + end) / 2;
            if s[mid] == ti {
                count += 1;
                continue 'a;
            } else if s[mid] > ti {
                end = mid;
            } else {
                start = mid + 1;
            }
        }
    }
    io.wl(count);
}