import java.util.*;


public class examPrep {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        String input = scanner.nextLine();
        printResult(input);
    }

    static void printResult(String input) {
        StringBuilder sb = new StringBuilder(input.charAt(0)+"");
        for (int i = 0; i < input.length(); i++) {
            char currentChar = input.charAt(i);
            if (sb.toString().charAt(sb.toString().length()-1)!=currentChar){
                sb.append(currentChar);
            }
        }
        System.out.println(sb);
    }

}