Sorry, I havn't got a keyboard with Greek characters!
You should be able to turn on different language keyboards in your devices system settings
I typed j for a random question and got it correct. HOW DID THAT HAPPEN
That's okay, I typed ψ and got it right.
I don't know how to get greek key board!
For android: https://support.google.com/android/answer/7068494?hl=en
How is the accepted answer for "fi" be "fée iota"?