# python battle.py
# -*- coding: utf-8 -*-
import sys, io
sys.stdout = io.TextIOWrapper(sys.stdout.buffer, encoding='utf-8')

S = input('戦いの記録を入力してください:')

for i in range(100):
    j = i + 3
    a = S[i:j]
    if  a == 'OOO':
        print ('West')
        break
    elif a == 'XXX':
        print ('East')
        break
    else:
        i += 1
else:
    print ('NA')