Not a sentence. Please fix this letters lesson, it't not helpful for learning Greek and Greek letters. Plus in strenghtening lessons it gets mixed with legit sentences like "ο ύμνος", where we have to translate to "the hymn". How are we supposed to know that in this case the answer is not "o hymn" or some other translation-transliteration mix?
since obviously most of us don't have a greek keyboard - http://www.lexilogos.com/keyboard/greek_modern.htm is a site that lets you type in greek! so you can just keep it open in another tab if you're on computer, and if you add greek as a language on your phone (i know you can do this on iphone anyways, i'm not sure about androids) then you can click the language button on your keyboard (the same one you click to do emojis) and then it gives you the greek characters to type in
I think that the cousre shall accept the transliteration of words and letters when answering in Greek. (I've just written "e epsilon" and it's a wrong answer)