#include <stdio.h>
#include <string.h>
#include <ctype.h>
int main(int argc, char* argv[])
{
static char str[256] = "hel4lo wo435435436rld!!!\0";
int sum = 0;
for (int i = 0; str[i] != '\0'; i++)
if (isdigit(str[i])) sum+=str[i] - '0';
printf("string = %s\nsum = %d\n",str,sum);
return 0;
}