Hi Mr. Tamada, I found that it seems to be modified into "i + 1" <img width="325" alt="001" src="https://user-images.githubusercontent.com/23090085/46743836-76096a00-ccdc-11e8-93b1-945c33022d39.png"> "aardvark" will show <img width="422" alt="002" src="https://user-images.githubusercontent.com/23090085/46743909-9cc7a080-ccdc-11e8-888a-8b31c95cf342.png"> thank you for sharing.