S = input()

if 'OOO' in S and 'XXX' in S:
    o = S.index('OOO')
    x = S.index('XXX')
    print(['West', 'East'][o < x])
elif 'OOO' in S:
    print('East')
elif 'XXX' in S:
    print('West')
else:
    print('NA')