import java.util.Scanner;
public class Main {
public static String count(String str) {
StringBuilder sb = new StringBuilder();
int count = 0;
char[] chars = str.toCharArray();
char ch = chars[0];
for (int i = 1; i
if (ch == chars[i]) {
++count;
System.out.println(chars[i]);
}
else {
if (count > 0) sb.append(String.valueOf(count));
sb.append(ch);
count = 0;
ch = chars[i];
}
if (i == chars.length-1) {
if (count > 0) sb.append(String.valueOf(count));
sb.append(ch);
}
}
return sb.toString();
}
public static void main(String[] args) {
Main m = new Main();
Scanner in = new Scanner(System.in);
String res = in.next();
System.out.println(m.count(res));
}
}