#include <fstream>
using namespace std;
ifstream cin("date.in");
ofstream cout("date.out");
int i,v[200],nr,j,k,t;
char s[200];
int main()
{
    cin>>s;
    for (i=0;i<9;i++)
        if (i>=2) v[++k]=s[i]-'0';
    for (i=0;i<=9;i++)
    {
        t=0;
        for (j=1;j<=k;j++)
        {
            if (i==v[j])
            {
                t=1;
                while(i==v[j]) j++;
                j--;
                nr++;
                continue;
            }
            else nr++;
        }
        if (t==0) nr++;
    }
    cout<<nr;
}