#include <iostream>
using namespace std;
int a[13],contor;
char x;
int main()
{
    while(cin>>x)
    {
        contor++;
        if(contor>2)a[x-'0']++;
        if(contor==9)break;
    }
    contor = 0;
    for(int i=0;i<=9;++i)
    {
        contor = contor + 8 - a[i];
    }
    cout<<contor;
    return 0;
}