#include <stdio.h>

 int charCount(char *str)

 {

     int iCount = 0;

     int i, j, k=0;

     char *p = str;

     char *q = p;

     while (*p)

     {

         p++;

         k++;

     }

     for (i=0; i<128; i++)

     {

         str = q;

         for (j=0; j<k; j++)

         {

             if (i == *str)

             {

                 iCount++;

                 break;

             }

             str++;

         }

     }

     return iCount;

 }

 int main()

 {

     char *p = "   abcdeef121";

     printf("%d\n", charCount(p));

     return 0;

 }