The easiest way to do that in Polish is to use a word "jaki" before an adjective with a noun which describe your feeling towards the object.
Let's take the second example: "What a pretty girl!".
In Polish: "Jaka ładna dziewczyna!"
Use a word "jaki" before masculine nouns. Jaki okropny dzień! (What a terrible day!)
Use "jaka" before feminine nouns. Jaka fajna kawiarnia! (What a cool café!)
Use a word "jakie" before neutral nouns. Jakie duże miasto! (What a big city!)
How to Express Your Impressions and Feelings in Polish. Exclamations.
