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import javax.xml.bind.DatatypeConverter;
import java.security.MessageDigest;
 
class Odin {
    public static void main (String[] args) {
	String mac_address = "10:D5:42:E3:D5:34";
	System.out.println(odin(mac_address));
    }

    public static String odin(String mac_address) {
	mac_address = mac_address.replaceAll("[^0-9a-zA-Z]", "");
	
	MessageDigest md = null;

	try {
	    md = MessageDigest.getInstance("SHA-1");
	} catch(Exception e) {}
	
	byte[] binary_sha = md.digest(DatatypeConverter.parseHexBinary(mac_address));

	return DatatypeConverter.printHexBinary(binary_sha).toLowerCase();
    }
}