csv 1.0.0-beta.1

extern crate csv;

use std::error::Error;
use std::io;
use std::process;

fn run() -> Result<u64, Box<Error>> {
    let mut rdr = csv::Reader::from_reader(io::stdin());

    let mut count = 0;
    for result in rdr.byte_records() {
        let record = result?;
        if &record[0] == b"us" && &record[3] == b"MA" {
            count += 1;
        }
    }
    Ok(count)
}

fn main() {
match run() {
Ok(count) => {
println!("{}", count);
}
Err(err) => {
println!("{}", err);
process::exit(1);
}
}
}