//> using dep org.scala-lang.modules::scala-parser-combinators::2.3.0

package aoc

import scala.util.parsing.combinator._

def iterate[T](get: => T | Null) =
  Iterator.continually(get).takeWhile(_ != null).map(_.nn)

def lines = iterate(scala.io.StdIn.readLine())

class CommonParser extends RegexParsers:
  val num = """-?(0|[1-9]\d*)""".r ^^ { _.toInt }
  val long = """-?(0|[1-9]\d*)""".r ^^ { _.toLong }

object CommonParser extends CommonParser