import java.util.*;
import java.lang.*;
import java.io.*;
 
class Ideone {
	public static void main (String[] args) throws java.lang.Exception {
        Scanner scn = new Scanner(System.in);
        String input = scn.nextLine();
 
        int repetitions = 0;
        for (int i = 0; i < input.length(); i++) {
            char c = input.charAt(i);
            if (i % 2 == 0)
                repetitions = c - '0';
            else
                for (int r = 0; r < repetitions; r++)
                    System.out.print(c);
        }
    }
}

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