li = input()
e, w = li.find('OOO'), li.find('XXX')
if e == -1 and w == -1:
    print('NA')
elif e == -1 and w >0:
    print('West')
elif e >0 and w == -1:
    print('East')
else:
    if e < w:
        print('East')
    else:
        print('West')