#include <stdio.h>

int main() {
  int c, bc, count, flag;
  bc = 0;
  flag = 0;
  while ((c = getchar()) != -1 && c != '\n') {
    flag = 1;
    if(c != bc) {
      if (count == 0) putchar(bc);
      else printf("%c%d", bc, count + 1);
      count = 0;
    } else {
      count++;
    }
    bc = c;
  }
  if (flag) {
    if (count == 0) putchar(bc);
    else printf("%c%d", bc, count + 1);
  } else {
    printf("0");
  }
  putchar('\n');
}
/* end */