ec, wc = 0, 0
A = input()
ans = "NA"
for i in range(len(A)):
    if 'O' == A[i]:
        ec += 1
        wc = 0
        if ec == 3:
            ans = ("East")
            break
    elif "X" == A[i]:
        wc += 1
        ec = 0
        if wc == 3:
            ans = ("West")
            break
print(ans)