#include <stdio.h>
#include <locale.h>
#include <string.h>

int main(void) {
  setlocale(LC_ALL, "en_US.utf8");
  char str[10]="2134512131";
  char *ach;
  char *ach2;
  int arr[10] = {};
  int counter = 0;
   int ch = '1';
   while(NULL != strchr(str, ch)) {
     ach = strchr(str, ch);

     if(counter != 0) {
      arr[++counter] = ach-str+1+arr[--counter];
      counter++;
     } else {
      arr[counter++] = ach-str+1;
     }

     strncpy(str, ach, 10);
     ach2 = strchr(str, str[1]);
     strncpy(str, ach2, 10);
   }
   for(int i = 0; i < counter; i++)
        printf("%d ", arr[i]);

   return 0;
}