S = input()
if len(S) < 3 :
    print("NA")
else :
    for i in range(N-2) :
        if S[i] == "O" and S[i+1] == "O" and S[i+2] == "O" :
            print("East")
            break
        elif S[i] == "X" and S[i+1] == "X" and S[i+2] == "X" :
            print("West")
            break
        else :
            print("NA")
            break