import java.util.*;
import java.util.stream.*;

public class Task270326 {
    public static void main(String[] args) {
        List<Optional<String>> optionals = Arrays.asList(
            Optional.of("java"),
            Optional.empty(),
            Optional.of("kotlin"),
            Optional.empty(),
            Optional.of("scala")
        );
        
        List<String> result = optionals.stream()
            .flatMap(opt -> opt.stream())
            .map(String::toUpperCase)
            .collect(Collectors.toList());
            
        System.out.println(result);
    }
}