"I am a boy."
Beta error aside, you should use the Russian language Cyrillic keyboard. Most smartphones can switch between English and Russian with a single key (if enabled in the keyboard settings), same with a PC (mnemonic and Russian layout). Most situations where you'd use Russian won't use the ABC alphabet, but rather the Cyrillic one. It's a good habit to get into sooner rather than later.
The shape is a bit different. You can see it better here: https://upload.wikimedia.org/wikipedia/commons/5/55/Diverses_apostrophes.png But it still doesn't work with Duolingo anyway.
For one, because that's how it's spelled. If you don't put it in, you're misspelling it. Also, the Russian letter ь changes the sound of the letter that comes before it, "softening" the sound. This changes the sound of the л to /lʲ/ instead of /ɫ/. If you don't understand IPA spellings, that won't make much sense to you, so I'd recommend watching a video about the letter ь to understand more.