import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;
import java.util.Base64;

public class Solution {
  public static void convert() throws NoSuchAlgorithmException {
    String text = "titok";
    MessageDigest md = MessageDigest.getInstance("SHA-512");
    md.update(text.getBytes());
    byte[] digest = md.digest();
    String hash = Base64.getEncoder().encodeToString(digest);
    System.out.println(hash);    
  }
}