# No.486 3 Straight Win(3連勝)
s = input()

if 'OOO' in s and 'XXX' in s:
    if s.index('OOO') < s.index('XXX'):
        print('East')
    else:
        print('West')
elif 'OOO' in s:
    print('East')
elif 'XXX' in s:
    print('West')
else:
    print('NA')