s = input()
a = s.find('OOO')
b = s.find('XXX')

if a >= 0 and b >= 0 and a > b:
    print('West')
elif a >= 0 and b >= 0 and a < b:
    print('East')
elif a < 0 and b > 0:
    print('West')
elif a > 0 and b < 0:
    print('East')
else:
    print('NA')