import scala.collection.mutable
import scala.io.StdIn.*
import scala.math.min

@main def main =
  val Array(n, m) = readLine().split(' ').map(_.toInt)
  val Array(s, g) = readLine().split(' ').map(_.toInt - 1)
  val edges = Array.fill(m){
    val Array(f, t) = readLine().split(' ').map(_.toInt - 1)
    (f, t)
  }
  val graph = Array.fill(n){Nil: List[Int]}
  for (f, t) <- edges do
    graph(f) ::= t
  val u = readLine().toInt
  val closed = if u > 0 then readLine().split(' ').map(_.toInt - 1) else Array[Int]()
  val visit = Array.fill(n){false}
  val stack = mutable.ArrayDeque[Int]().addOne(s)
  visit(s) = true
  for i <- closed do
    visit(i) = true
  while stack.nonEmpty do
    val current = stack.removeLast()
    for next <- graph(current) do
      if !visit(next) then
        visit(next) = true
        stack.addOne(next)
  println(if (visit(g)) "Yes" else "No")