import java.util.Scanner

object Problem203 {
  def main(args: Array[String]) {
    val sc = new Scanner(System.in)
    val w1 = sc.next()
    val w2 = sc.next()
    val gw = w1 + w2

    val holidays = gw.split("x+")
    val holidaysLength = holidays.map(_.length)
    val longest = holidaysLength.reduceOption(_ max _).getOrElse(0)
    println(longest)
  }
}