S = input()
WC = 0
for i in range(len(S)-1):
    
    if S[i] == S[i+1] :
        WC += 1
        if WC == 2:
            print(("East","West")[S[i]=="X"])
            break
    else:
        WC = 0

print("NA") if WC != 2 else WC