import java.util.Scanner;

public class Main {
    public static void main(String[] args) {
        final Scanner scanner = new Scanner(System.in);
        final StringBuilder result = new StringBuilder();
        final String in = scanner.nextLine() + "❤";
        int currentNumber = 47, size = 0;
        for (int i = 0; i < in.length(); i++) {
            int index = in.charAt(i);
            if (index != currentNumber) {
                if (currentNumber != 47) {
                    result.append(size).append((char) currentNumber);
                }
                currentNumber = index;
                size = 1;
                continue;
            }
            size++;
        }
        System.out.println(result);
    }
}