public class ReYo {
public static void main(String[] args) {
String str = "111111kakkkkkkkkkkwwwaacbbdAAA";
String s = "";
Matcher m = Pattern.compile("(\w)\1*").matcher(str);
// Pattern pattern = Pattern.compile("(.)\1*");
while (m.find()) {
s += m.group().subSequence(0, 1);
}
System.out.println(s);
}
}