s = input()
if 'OOO' not in s:
    if 'XXX' not in s:
        print('NA')
    else:
        print('West')
    exit()
if 'XXX' not in s:
    print('East')
    exit()
a = s.index('OOO')
b = s.index('XXX')
if a < b:
    print('East')
else:
    print('West')