s = list(input())
e, w = 0, 0

for i in s:
    if i == 'O':
        e += 1
        w = 0
    else:
        w += 1
        e = 0

    if e == 3:
        print('East')
        break

    if w == 3:
        print('West')
        break
else:
    print('NA')