package StringAndTextProcessing.Lab;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.util.regex.Matcher;
import java.util.regex.Pattern;

public class SeriesOfLetters {
    public static void main(String[] args) throws IOException {
        BufferedReader reader = new BufferedReader(new InputStreamReader(System.in));
        String line = reader.readLine();

        Pattern pattern = Pattern.compile("(\\w)(\\1+)");

        Matcher matcher = pattern.matcher(line);

        while (matcher.find()) {
            line = line.replace(matcher.group(), String.valueOf(matcher.group(1).charAt(0)));
        }

        System.out.println(line);

    }
}