S = input()
N = len(S)
w = 0
s = 0
for i in range(N):
    if S[i] == 'O':
        s += 1
        w = 0
    elif S[i] == 'X':
        w += 1
        s = 0
    if s == 3:
        print('East')
        exit()
    if w == 3:
        print('West')
        exit()
print('NA')