# -*- coding: utf-8 -*-

s = list(input())
e = 0
w = 0

for i in range(len(s)):
    if s[i] == "O":
        w = 0
        e += 1
    else:
        e = 0
        w += 1
    if e >= 3:
        print("East")
        break
    if w >= 3:
        print("West")
        break
else:
    print("NA")