s = input()
n = len(s)
e, w = 0, 0
if s[0] == 'O':
    e += 1
else:
    w += 1
for i in range(1, n):
    if s[i] == s[i - 1]:
        if e > 0:
            e += 1
            if e == 3:
                print("East")
                exit()
        else:
            w += 1
            if w == 3:
                print("West")
                exit()
    else:
        e = w = 0
        if s[i] == 'O':
            e += 1
        else:
            w += 1
print("NA")