#include <stdio.h>
int main()
{   int a,b,c=0;
    printf("a b = ");
    scanf("%d %d", &a, &b);
    while (a * b)
    {
        c += (a % 10 == b % 10);
        a /= 10;
        b /= 10;
    }
    printf("answer = %d\n", c);
    return 0;
}