import java.text.*;
import java.util.Date;

class Ideone
{
	public static void main (String[] args) throws java.lang.Exception
	{
		DateFormat format = new SimpleDateFormat("EEE MMM dd HH:mm:ss yyyy Z");
		String s = "Tue Dec 22 19:16:57 2015 UTC";
		s = s.replace("UTC", "GMT");
		Date d = format.parse(s);
		System.out.println(d.toString());
	}
}