iPad with hardware-keyboard in Japanese, “@“ does not appear in iShell even if typing the at-mark key.

I’m starting to use iSH for my linux environment in iPad. And I’m trying to access my machine using the internet. Then I typed the “@“ key, but the “@“ mark does not appear in iShell and I’m confused… The other keys seems to work well except “@“… Could you help me to fix this issue. My keyboard is Apple Magic Keyboard (Japanese) , and the interesting things are my “@“ working well for all other application software except iShell… For example, now I’m writing the message to you in the Github-web site with “@“. So it’s no problem for me. But once I enter iShell, it does not work.

Could you help me any advise. Thank you in advance.

Best wishes, SN.