import java.util.Arrays;
import java.util.Scanner;

public class Test {
	public static void main(String[] args) {
		Scanner scanner = new Scanner(System.in);
		String str = scanner.nextLine()+ "*";
		char[] c = str.toCharArray();
		int count = 1;
		//System.out.println(Arrays.toString(c));
		for (int i = 1; i < c.length; i++) {
			if (c[i] == c[i-1]) {
				count++;
			} else {
				System.out.print(count+""+c[i-1]);
				count = 1;
			}
		}

	}
}