#include<stdio.h>

unsigned Count(unsigned a, unsigned b)
{
   unsigned x[10] = {0}, y[10] = {0}, i, count = 0;
   do {
      x[a % 10] = 1;
      a /= 10;
   }while(a);
   do {
      y[b % 10] = 1;
      b /= 10;
   }while(b);
   for(i = 0; i < 10; i++)
      count += x[i] & y[i];
   return count;
}

int main()
{
   unsigned a, b;
   printf("a = "); scanf("%u", &a);
   printf("b = "); scanf("%u", &b);
   printf("count = %u\n", Count(a, b));
   return 0;
}