package main

import (
	"bytes"
	"fmt"
	"io/ioutil"
	"regexp"
	"strconv"
)

func main() {
	total := 0 // Number of valid passwords
	r, _ := regexp.Compile(`(\d+)-(\d+) (\w): (.+)`)
	d, _ := ioutil.ReadFile("in2.txt")
	lines := bytes.Split(d, []byte("\n"))
	for _, l := range lines {
		parts := r.FindStringSubmatch(string(l))
		if len(parts) != 0 {
			min, _ := strconv.Atoi(parts[1])
			max, _ := strconv.Atoi(parts[2])
			char := parts[3]
			password := parts[4]
			s := false
			e := false
			// Not utf8-safe! Bad practice, but it doesn't matter here
			if string(password[min-1]) == char {
				s = true
			}
			if string(password[max-1]) == char {
				e = true
			}
			if s != e {
				total += 1
			}
		}
	}
	fmt.Println(total)
}