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1 use std::error::Error;
2 use std::io;
3 use std::process;
4 
run() -> Result<u64, Box<dyn Error>>5 fn run() -> Result<u64, Box<dyn Error>> {
6     let mut rdr = csv::Reader::from_reader(io::stdin());
7     let mut record = csv::ByteRecord::new();
8 
9     let mut count = 0;
10     while rdr.read_byte_record(&mut record)? {
11         if &record[0] == b"us" && &record[3] == b"MA" {
12             count += 1;
13         }
14     }
15     Ok(count)
16 }
17 
main()18 fn main() {
19     match run() {
20         Ok(count) => {
21             println!("{}", count);
22         }
23         Err(err) => {
24             println!("{}", err);
25             process::exit(1);
26         }
27     }
28 }
29