#include <stdio.h>

char string[100];

int main()
{
   char value;
   int  howmany;
   int  index;
   int  counter = 0;
   int  found;

   fscanf(stdin, "%s", &string[0]);

   howmany = fscanf(stdin, "%c", &value);
   while (howmany == 1)
   {
      index = 0;
      found = 0;
      while (string[index] != 0)
      {
         if (value == string[index])
            found = 1;
         index = index + 1;
      }
      if (found)
         counter = counter + 1;
      howmany = fscanf(stdin, "%c", &value);
   }
   fprintf(stdout, "%d\n", counter);
}