S = int(input())
ans = "NA"
E = 0
W = 0
for i in range(len(S)):
    if S[i] == "O":
        W = 0
        E += 1
    else:
        E = 0
        W += 1
    if E == 3:
        ans = "East"
        break
    elif W == 3:
        ans = "West"
        break
print(ans)