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