import math
const goal = 3
let S = stdin.readLine
var cnt, m: array[2, int]

for s in S:
  m[0] = int(s == 'X')
  m[1] = int(s == 'O')

  for i in 0 ..< 2:
    if cnt[i] == 0:
      cnt[i] += m[i]
    else:
      cnt[i] *= 2 * m[i]

  if cnt.max >= 2 ^ (goal - 1):
    echo ["West", "East"][find(cnt, cnt.max)]
    quit()

echo "NA"