This is a tool I made when I was a primary school student, unfortunately it has been deleted by me. I'm restoring it.
first remake： http://anan.i234.me:7777/ror/res/encryption/ROR-E.apk
If you use a widescreen device, it may mess up the UI. I think it's a bad remake, so I might do it with other UI frameworks in the future. In general case it will be like this：
