#include <stdio.h>
#include <ctype.h>

int main(void) 
{
   char array[] = "1 2\f3\n4\r5\t6\v7";
   printf("%s\n", array);
   int num = 0;
   for (int i = 0; i < sizeof(array); i++) {
      if (isspace(array[i])) { //do nothing 
      } else if (isdigit(array[i])) {
         int n = array[i] - '0';
         num = (num * 10) + n;
      } else {
         break;
      }
   }
   printf("%d\n", num);
   return 0;
}