(define (shori-hantei xs)
  (let ((east (string-scan xs "OOO"))
        (west (string-scan xs "XXX")))
    (cond
     ((and (not east) (not west))
      "NA")
     ((not east)
      "West")
     ((not west)
      "East")
     ((< east west)
      "East")
     (else
      "West"))))

(print (shori-hantei (read-line)))