use std::collections::HashMap;
use std::error::Error;
use std::fs::File;
use std::io::BufReader;
use std::io::prelude::*;

fn main() -> std::io::Result<()> {
    let file = match File::open("input") {
        Err(why) => panic!("couldn't open input: {}", Error::description(&why)),
        Ok(file) => file,
    };

    let reader = BufReader::new(file);
    let lines = reader.lines();

    for result in lines {
        let l = result.unwrap();
        let mut freq = HashMap::new();
        let mut is2 = false;
        let mut is3 = false;

        for ch in l.chars() {
            let count = freq.entry(ch).or_insert(0);
            *count += 1;
        }

        for (_ch, count) in freq {
            if count == 2 {
                is2 = true;
            }
            if count == 3 {
                is3 = true;
            }
        }

        if is2 {
            count2+=1;
        }
        
        if is3 {
            count3+=1;
        }
    }

    println!("2: {} 3: {} 2*3: {}", count2, count3, count2 * count3);

    Ok(())
}