/* package whatever; // don't place package name! */

class Main{
  static String c(String i){
    return i.replaceAll("(.)(?!\\1)(?i)\\1", "$1");
  }

  public static void main(String[] a){
    System.out.println(c("bBaAdD"));
    System.out.println(c("NniIcCeE"));
    System.out.println(c("Tt eE Ss tT"));
    System.out.println(c("sS Ee tT"));
    System.out.println(c("1!1!1sStT!"));
    System.out.println(c("nN00bB"));
    System.out.println(c("(eE.gG.)"));
    System.out.println(c("Hh3lL|@!"));
    System.out.println(c("Aaa"));
    System.out.println(c("aaaaa"));
    System.out.println(c("aaAaa"));
  }
}