S = input()
d = {"O": 0, "X": 0}
n = {"O": "X", "X": "O"}
for s in S:
    d[s] += 1
    d[n[s]] = 0
    if d[s]==3:
        if s=="O":
            print("East")
        else:
            print("West")
        exit()

print("NA")