import scala.collection.mutable
import scala.io.StdIn.*
import scala.math.*
import scala.util.chaining.*
@main def main =
  inline val p = 90007
  val Array(_, q, x, y) = readLine().split(' ').map(_.toLong)
  val remQ = (0 to Int.MaxValue).collectFirst{case m if (y + m * q) % 10 != 0 && (y + m * q).toString.reverse.toLong % p != 0 => y + m * q}.get
  var rest = remQ.toString.reverse.toLong % p
  val result = mutable.StringBuilder(remQ.toString.reverse)
  while rest != x do
    rest = rest * 10 % p
    result.addOne('0')
  println(result.toString())