import java.util.regex.Matcher;
import java.util.regex.Pattern;
public class Main {
public static void main(String[] args) {
String str = "this is a test";
StringBuffer sb = new StringBuffer();
Matcher m = Pattern.compile("([a-z])([a-z]*)", Pattern.CASE_INSENSITIVE).matcher(str);
while (m.find()) {
m.appendReplacement(sb, m.group(1).toUpperCase() + m.group(2).toLowerCase());
}
System.out.println(m.appendTail(sb).toString());
}
}
//This Is A Test