program main
  implicit none
  character*100::S
  character*3,parameter::e="OOO",w="XXX"
  integer::i
  read *,S
  do i=1,LEN_TRIM(S)-2
     if(S(i:i+2).eq.e) then
        print '(a)',"East"
        return
     else if(S(i:i+2).eq.w) then
        print '(a)',"West"
        return
     end if
  end do
  print '(a)',"NA"
end program main