s = input()
w = 0
e = 0
win_or_lose = 0
for i in s:
    if i == "X":
        e = 0
        w += 1
    else:
        w = 0
        e += 1
    if w == 3:
        print("West")
        win_or_lose = 1
        break
    elif e == 3:
        print("East")
        win_or_lose = 1
        break

if win_or_lose == 0:
    print("NA")