import java.io.UnsupportedEncodingException;
import java.util.Base64;

class ex {

	public static void main(String[] args) 
			throws UnsupportedEncodingException {
		 Base64.Decoder decoder = Base64.getDecoder();
		 String encodedText = "5b6I5a655piT5ZCn77yB";
		 //解碼
		 System.out.println(new String(decoder.decode(encodedText), "UTF-8"));
	}
}