import java.time.LocalDate;
import java.time.format.DateTimeFormatter;
import java.util.Locale;
import java.util.stream.Stream;

public class Main {
	public static void main(String[] args) {
		DateTimeFormatter dtf = DateTimeFormatter.ofPattern("[uuuu-MM-dd][M/dd/uuuu]", Locale.ENGLISH);

		// Test
		Stream.of(
				"2021-11-09",
				"11/09/2021",
				"5/09/2021"
		).forEach(s -> System.out.println(LocalDate.parse(s, dtf)));
	}
}