import java.time.LocalDateTime;
import java.time.OffsetDateTime;
import java.time.ZoneId;
import java.time.ZonedDateTime;
import java.time.format.DateTimeFormatter;
import java.util.Locale;

public class Main {
	public static void main(String[] args) {
		DateTimeFormatter formatter = DateTimeFormatter.ofPattern("uuuuMMddHHmmss", Locale.ENGLISH);

		ZonedDateTime zdt = LocalDateTime.parse("20210817132649", formatter)
								.atZone(ZoneId.of("Etc/UTC"));

		OffsetDateTime odt = zdt.toOffsetDateTime();

		System.out.println(odt);
	}
}