import scala.actors.Actor
import scala.actors.Actor._

object Akt1 extends Actor {
    def act() {
        while (true) {
            receive {
                case a : Int => {
                    if (a < 10) {
                        print(a +", ")
                        val next = a+1
                        Akt2 ! next
                        Akt3 ! next
                    } else {
                        exit()
                    }
                }
            }
        }
    }
}

object Akt2 extends Actor {
    def act() {
        while (true) {
            receive {
                case a : Int => {
                    if (a < 10) {
                        print(a +", ")
                        val next = a+1
                        Akt1 ! next
                        Akt3 ! next
                    } else {
                        exit()
                    }
                }
            }
        }
    }
}

object Akt3 extends Actor {
    def act() {
        while (true) {
            receive {
                case a : Int => {
                    if (a < 10) {
                        print(a +", ")
                        val next = a+1
                        Akt1 ! next
                        Akt2 ! next
                    } else {
                        exit()
                    }
                }
            }
        }
    }
}

object Main {
  def main(args : Array[String]) : Unit = {
    Akt1.start()
    Akt2.start()
    Akt3.start()
    Akt1 ! 0
  }
}