program main
  implicit none
  integer::N,K,X,i,tmp
  character::q(2)
  integer,allocatable::A(:),B(:),C(:),cupi(:),cupf(:)
  logical::is_first=.true.
  read *,N,K,X
  allocate(A(K),B(K),C(N),cupi(N),cupf(N))

  do i=1,K
     if(i.eq.X) then
        read *,q
     else
        read *, A(i),B(i)
     end if
  end do
  cupi = (/(i,i=1,N)/)
  read *,cupf

! swap forward
  do i=1,X-1
     tmp = cupi(A(i))
     cupi(A(i)) = cupi(B(i))
     cupi(B(i)) = tmp
  end do
! swap backward
  do i=K,X+1,-1
     tmp = cupf(A(i))
     cupf(A(i)) = cupf(B(i))
     cupf(B(i)) = tmp
  end do
  do i=1,N
     if(cupi(i).ne.cupf(i))then
        if(is_first.eqv..true.) then
           is_first = .false.
           write (*,'(i0," ")',advance='no') i
        else
           write (*,'(i0)',advance='yes') i
           return
        end if
     end if
  end do
end program main