S = input().rstrip()
e = 0
w = 0
for s in S:
    if s == "O":
        w = 0
        e += 1
        if e == 3:
            print("East")
            break
    elif s == "X":
        e = 0
        w += 1
        if w == 3:
            print("West")
            break
else:
    print("NA")