if __name__ == "__main__":
    S = input()
    for i in range(len(S) - 2):
        if (S[i] == 'O' and S[i + 1] == 'O' and S[i + 2] == 'O'):
            print ("East")
            exit()
        elif (S[i] == 'X' and S[i + 1] == 'X' and S[i + 2] == 'X'):
            print ("West")
            exit()
    print ("NA")