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


text = input()
if 'OOO' in text:
    O_position = text.index('OOO')
else:
    O_position = 1000
if 'XXX' in text:
    X_position = text.index('XXX')
else:
    X_position = 1000

if O_position == X_position:
    print('NA')
elif O_position < X_position:
    print('East')
elif X_position < O_position:
    print('West')