S = input()
east_index = S.find('OOO')
west_index = S.find('XXX')
if east_index >= 0 and west_index >= 0:
    print('East' if east_index < west_index else 'West')
else:
    print('East' if east_index >= 0 else 'West' if west_index >= 0 else 'NA')