कन्वर्ट करें और यूनिक शहर इकट्ठा करें

public class CityProcessor {
    public static void main(String[] args) {
        List cities = List.of("paris", "london", "new york", "paris");

        Set uniqueUppercaseCities = cities.stream()
        	// Convert each city name to uppercase
            .____(city -> city.toUpperCase())
            // Collect the result and store in a Set
            .____(____);

        System.out.println(uniqueUppercaseCities);
    }
}